Qualitative evaluation method for grey dyeing degree of o-phthalaldehyde disinfectant

Abstract

The invention discloses a qualitative evaluation method for the grey dyeing degree of an o-phthalaldehyde disinfectant. The qualitative evaluation method comprises the following steps: S1, observing with naked eyes; s2, carrying out spectral reflection; s3, measuring by a colorimeter; s4, performing macro observation; s5, cleaning and testing; s6, testing the color fastness, namely coating or spraying a solution containing o-phthalaldehyde in a disinfectant on the surface of the sample, generally fibers or other dyeable materials, naturally drying or properly drying the sample, and observing whether the surface has a grey dyeing phenomenon (namely irregular dyeing, dim color or spots) or not. If the surface of a sample becomes non-uniform or obvious grey dyeing spots appear, the grey dyeing degree of the disinfectant is high, the grey dyeing on the cloth is detected, observed and cleaned by various evaluation methods, various equipment and various common methods, various results are combined and analyzed, and the grey dyeing degree of the disinfectant is high. The qualitative evaluation on the grey dyeing degree of the o-phthalaldehyde disinfectant is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of qualitative evaluation methods for graying degree, and particularly to a qualitative evaluation method for the graying degree of ortho-phthalaldehyde disinfectant solution. Background Art

[0002] Ortho-phthalaldehyde (also known as terephthalaldehyde, abbreviated as PHA), as a common chemical substance, is widely used in fields such as disinfectant solutions and dyes. For the qualitative evaluation of the graying degree of disinfectant solutions, it is usually judged by observing the color change, graying situation and other possible physical changes on the surface of the dyed object; The qualitative evaluation methods for graying degree are relatively single and not rigorous enough, and cannot accurately judge the graying degree on the fabric. Therefore, the present invention proposes a qualitative evaluation method for the graying degree of ortho-phthalaldehyde disinfectant solution to solve the above problems. Summary of the Invention

[0003] Based on the technical problem that the qualitative evaluation methods for graying degree are relatively single and not rigorous enough, and cannot accurately judge the graying degree on the fabric in the background art, the present invention proposes a qualitative evaluation method for the graying degree of ortho-phthalaldehyde disinfectant solution.

[0004] A qualitative evaluation method for the graying degree of ortho-phthalaldehyde disinfectant solution proposed by the present invention includes the following steps: S1: Visual observation; S2: Spectral reflection; S3: Measurement with a color difference meter; S4: Macroscopic observation; S5: Cleaning test; S6: Color fastness test.

[0005] Preferably, in the step S1, the solution containing ortho-phthalaldehyde in the disinfectant solution is coated or sprayed on the surface of the specimen, usually a fiber or other dyeable material, and allowed to dry naturally or subjected to appropriate drying treatment, and whether there is graying phenomenon (i.e., irregular dyeing, dull color or spots) on the surface is observed. If the surface of the specimen becomes uneven or obvious graying spots appear, it indicates that the graying degree of the disinfectant solution is relatively high. If the surface color changes evenly and is lighter in color, it indicates that the graying degree is relatively low or there is no graying phenomenon.

[0006] Preferably, in the step S2, a spectrophotometer or other spectral analysis instrument is used to measure the reflection spectrum of the surface of the treated sample, and the difference in the reflection spectra of the untreated and treated samples is compared. The change in the reflection spectrum reflects the degree of change in the color of the sample. If the color depth increases or there is an obvious color deviation, it indicates that the gray staining effect of the disinfectant is strong. The spectral reflectance method is a reliable technique that can accurately evaluate the color change of materials after being treated with disinfectants or other chemicals, especially playing an important role in the qualitative and quantitative evaluation of the gray staining degree. By analyzing the reflection spectrum, the gray staining situation and its severity of the sample can be effectively judged.

[0007] Preferably, in the step S3, a color difference meter is used to measure the surface color of the sample after being treated with the disinfectant, and the values of its brightness, red-green degree, and yellow-blue degree are recorded. The color difference meter measurement method is a technique commonly used for quantitatively analyzing the color difference of objects. By measuring the color of the sample surface and comparing it with a standard sample, the degree of color change is determined. This method is commonly used in the quality control of various products, color consistency inspection, and dyeing effect evaluation. The color difference meter can accurately measure the color of the reflected light on the object surface and provide the color difference value between the object and the standard sample.

[0008] Preferably, in the step S4, the treated sample is placed under a microscope to observe the details of the staining, and check for phenomena such as uneven color, particle attachment, and staining spots. By observing under the microscope, it can be judged whether the gray staining is uniform and whether there is local over-staining.

[0009] Preferably, in the step S5, the treated sample is washed with water. Warm water at 30 - 45 degrees Celsius is prepared, and a cleaning agent is also prepared. The cloth contaminated with the disinfectant is soaked in the warm water, and after 10 - 15 minutes, it is rubbed for 5 - 10 minutes. Observe the color change of the sample after washing and whether there is residual gray staining. If the color of the sample after cleaning is significantly weakened or the gray staining phenomenon is removed, it indicates that the gray staining ability of the disinfectant is weak. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the gray staining degree is high.

[0010] Preferably, in the step S6, a standard color fastness test method is used to test the wash fastness of the treated sample, and the color fastness of the sample under standard conditions is evaluated. If the sample fades significantly or has gray staining after washing, it indicates that the gray staining degree is high.

[0011] Preferably, through the above qualitative evaluation methods, the staining performance of the disinfectant is evaluated based on the gray staining effect of phthalaldehyde in the disinfectant, and a comprehensive evaluation is carried out by combining multiple methods.

[0012] Advantages of the present invention: The present invention detects, observes, and cleans the gray staining on fabrics through various evaluation methods, using various devices and common methods, and combines and analyzes various results to achieve a qualitative evaluation of the gray staining degree of ortho-phthalaldehyde disinfectant solution. Description of the Drawings

[0013] Figure 1 It is the flowchart of the work proposed by the present invention. Detailed Embodiments

[0014] The present invention will be further illustrated below in conjunction with specific embodiments.

[0015] Refer to Figure 1 , Embodiment 1 A method for qualitative evaluation of the gray staining degree of ortho-phthalaldehyde disinfectant solution is proposed in this embodiment, including the following steps: S1: Visual observation. Apply or spray the solution containing ortho-phthalaldehyde in the disinfectant on the surface of the specimen, usually a fiber or other dyeable material, and let it dry naturally or perform appropriate drying treatment. Observe whether there is gray staining on the surface (i.e., irregular staining, dull color, or spots). If the surface of the specimen becomes uneven or obvious gray staining spots appear, it indicates a higher gray staining degree of the disinfectant. If the surface color changes evenly and is lighter, it indicates a lower gray staining degree or no gray staining phenomenon. S2: Spectral reflection. Measure the reflection spectrum of the treated sample surface with a spectrophotometer or other spectral analysis instruments, and compare the reflection spectrum differences between the untreated and treated samples. The change in the reflection spectrum reflects the degree of color change of the sample. If the color depth increases or obvious color deviation appears, it indicates a stronger gray staining effect of the disinfectant. The spectral reflection method is a reliable technique that can accurately evaluate the color change of materials after treatment with disinfectants or other chemicals, especially playing an important role in the qualitative and quantitative evaluation of the gray staining degree. By analyzing the reflection spectrum, the gray staining situation and its severity of the sample can be effectively judged. S3: Color difference meter measurement. Use a color difference meter to measure the surface color of the sample after treatment with the disinfectant, and record the values of its brightness, red-green degree, and yellow-blue degree. The color difference meter measurement method is a technique commonly used for quantitative analysis of the color difference of objects. By measuring the color of the sample surface and comparing it with a standard sample, the degree of color change is determined. This method is commonly used in the quality control of various products, color consistency inspection, and dyeing effect evaluation. The color difference meter can accurately measure the color of the reflected light on the object surface and provide the color difference value between the sample and the standard sample. S4: Macroscopic observation. Place the treated sample under a microscope to observe the details of the staining, and check for phenomena such as uneven color, particle attachment, and staining spots. Through microscopic observation, it can be judged whether the gray staining is uniform and whether there is local over-dyeing. S5: Cleaning test. The treated samples are washed with water. Prepare warm water at 30 - 45 °C and a cleaning agent. Soak the fabric contaminated with the disinfectant in the warm water. After 10 - 15 minutes, scrub for 5 - 10 minutes. Observe the color change of the sample after washing and whether there is residual gray staining. If the color of the sample after washing is significantly weakened or the gray staining is removed, it indicates that the gray staining ability of the disinfectant is weak. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the degree of gray staining is high. S6: Colorfastness test. Use the standard colorfastness test method to test the wash fastness of the treated samples and evaluate the colorfastness of the samples under standard conditions. If the samples fade significantly or show gray staining after washing, it indicates a high degree of gray staining.

[0016] Through the above qualitative evaluation method, evaluate the dyeing performance of the disinfectant based on the gray staining effect of phthalaldehyde in the disinfectant, and conduct a comprehensive evaluation by combining multiple methods.

[0017] Refer to Figure 1 , Example 2 In this example, a qualitative evaluation method for the degree of gray staining of phthalaldehyde disinfectant is proposed, including the following steps: S1: Visual observation. Coat or spray the solution containing phthalaldehyde in the disinfectant on the surface of the specimen, usually a fiber or other dyeable material, and let it dry naturally or perform appropriate drying treatment. Observe whether there is gray staining on the surface (i.e., irregular dyeing, dull color or spots). If the surface of the specimen becomes uneven or obvious gray staining spots appear, it indicates a high degree of gray staining of the disinfectant. If the surface color changes evenly and is lighter in color, it indicates a lower degree of gray staining or no gray staining. S2: Spectral reflectance. Measure the reflectance spectrum of the surface of the treated sample with a spectrophotometer or other spectral analysis instruments, and compare the difference in the reflectance spectra of the untreated and treated samples. The change in the reflectance spectrum reflects the degree of color change of the sample. If the color depth increases or obvious color deviation appears, it indicates a strong gray staining effect of the disinfectant. The spectral reflectance method is a reliable technique that can accurately evaluate the color change of materials treated with disinfectants or other chemicals, especially playing an important role in the qualitative and quantitative evaluation of the degree of gray staining. By analyzing the reflectance spectrum, the gray staining situation and its severity of the sample can be effectively judged. S3: Color difference meter measurement. Use a color difference meter to measure the surface color of the sample after treatment with the disinfectant, and record the values of its brightness, red-green degree, and yellow-blue degree. The color difference meter measurement method is a technique commonly used for quantitative analysis of color differences in objects. By measuring the color of the sample surface and comparing it with a standard sample, the degree of color change is determined. This method is commonly used in quality control, color consistency inspection, and dyeing effect evaluation of various products. The color difference meter can accurately measure the color of the reflected light on the object surface and provide the color difference value between the sample and the standard sample; S4: Macroscopic observation. Place the treated sample under a microscope to observe the details of the dyeing, and check for phenomena such as uneven color, particle attachment, and dyeing spots. By observing under the microscope, it is possible to judge whether the gray dyeing is uniform and whether there is local over-dyeing; S5: Washing test. Wash the treated sample with water. Prepare warm water at 30 - 45 degrees Celsius and a cleaning agent. Soak the cloth contaminated with the disinfectant in the warm water, and then rub it for 5 - 10 minutes after 10 - 15 minutes. Observe the color change of the sample after washing and whether there is residual gray dyeing. If the color of the sample significantly weakens or the gray dyeing phenomenon is removed after washing, it indicates that the gray dyeing ability of the disinfectant is weak. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the degree of gray dyeing is high; S6: Color fastness test. Use the standard color fastness test method to test the wash fastness of the treated sample and evaluate the color fastness of the sample under standard conditions. If the sample significantly fades or produces gray dyeing after washing, it indicates a high degree of gray dyeing.

[0018] Through the above qualitative evaluation methods, the dyeing performance of the disinfectant is evaluated based on the gray dyeing effect of phthalaldehyde in the disinfectant, and a comprehensive evaluation is carried out by combining multiple methods.

[0019] Refer to Figure 1 , Example 3 In this example, a qualitative evaluation method for the gray dyeing degree of phthalaldehyde disinfectant is proposed, including the following steps: S1: Visual observation. Coat or spray the solution containing phthalaldehyde in the disinfectant on the surface of the specimen, usually a fiber or other dyeable material, and let it dry naturally or perform appropriate drying treatment. Observe whether there is gray dyeing on the surface (i.e., irregular dyeing, dull color, or spots). If the surface of the specimen becomes uneven or obvious gray dyeing spots appear, it indicates a high degree of gray dyeing of the disinfectant. If the surface color changes evenly and is lighter in color, it indicates a low degree of gray dyeing or no gray dyeing phenomenon; S2: Spectral reflection. Measure the reflection spectrum of the surface of the treated sample using a spectrophotometer or other spectral analysis instrument. Compare the differences in the reflection spectra of the untreated and treated samples. The change in the reflection spectrum reflects the degree of color change of the sample. If the color depth increases or there are obvious color deviations, it indicates that the graying effect of the disinfectant is strong. The spectral reflection method is a reliable technique that can accurately evaluate the color change of materials after being treated with disinfectants or other chemicals. It plays an important role especially in the qualitative and quantitative evaluation of the graying degree. By analyzing the reflection spectrum, the graying situation and its severity of the sample can be effectively judged; S3: Color difference meter measurement. Measure the surface color of the sample treated with the disinfectant using a color difference meter, and record the values of its brightness, red-green degree, and yellow-blue degree. The color difference meter measurement method is a technique commonly used for quantitative analysis of color differences in objects. By measuring the color of the sample surface and comparing it with a standard sample, the degree of color change is determined. This method is commonly used in the quality control of various products, color consistency inspection, and dyeing effect evaluation. The color difference meter can accurately measure the color of the reflected light on the object surface and provide the color difference value between the sample and the standard sample; S4: Macroscopic observation. Place the treated sample under a microscope to observe the details of the staining, and check for phenomena such as uneven color, particle attachment, and staining spots. By observing under the microscope, it can be judged whether the graying is uniform and whether there is local over-staining; S5: Washing test. Wash the treated sample with water. Prepare warm water at 30 - 45 degrees Celsius and a cleaning agent. Soak the fabric contaminated with the disinfectant in the warm water, and scrub it for 5 - 10 minutes after 10 - 15 minutes. Observe the color change of the sample after washing and whether there is residual graying phenomenon. If the color of the sample after washing is significantly weakened or the graying phenomenon is removed, it indicates that the graying ability of the disinfectant is weak. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the graying degree is high; S6: Color fastness test. Use the standard color fastness test method to test the wash fastness of the treated sample and evaluate the color fastness of the sample under standard conditions. If the sample fades significantly or has graying after washing, it indicates a high graying degree.

[0020] Through the above qualitative evaluation methods, evaluate the dyeing performance of the disinfectant based on the graying effect of o-phthalaldehyde in the disinfectant, and conduct a comprehensive evaluation by combining multiple methods.

[0021] Refer to Figure 1 , Example 4 In this example, a qualitative evaluation method for the graying degree of o-phthalaldehyde disinfectant is proposed, including the following steps: S1: Visual observation. Apply or spray a solution containing o-phthalaldehyde in the disinfectant on the surface of the specimen, usually a fiber or other dyeable material, and let it dry naturally or perform appropriate drying treatment. Observe whether there is gray staining on the surface (i.e., irregular staining, dull color, or spots). If the surface of the specimen becomes uneven or obvious gray staining spots appear, it indicates a high degree of gray staining of the disinfectant. If the surface color changes evenly and is lighter, it indicates a low degree of gray staining or no gray staining phenomenon; S2: Spectral reflectance. Measure the reflectance spectrum of the surface of the treated sample using a spectrophotometer or other spectral analysis instrument, and compare the differences in the reflectance spectra of the untreated and treated samples. The change in the reflectance spectrum reflects the degree of color change of the sample. If the color depth increases or obvious color deviation appears, it indicates a strong gray staining effect of the disinfectant. The spectral reflectance method is a reliable technique that can accurately evaluate the color change of materials after treatment with disinfectants or other chemicals, especially playing an important role in the qualitative and quantitative evaluation of the degree of gray staining. By analyzing the reflectance spectrum, the gray staining situation and its severity of the sample can be effectively judged; S3: Color difference meter measurement. Use a color difference meter to measure the surface color of the sample treated with the disinfectant, and record the values of its brightness, red-green degree, and yellow-blue degree. The color difference meter measurement method is a technique commonly used for quantitative analysis of color differences in objects. By measuring the color of the sample surface and comparing it with a standard sample, the degree of color change is determined. This method is commonly used in quality control, color consistency inspection, and dyeing effect evaluation of various products. The color difference meter can accurately measure the color of the reflected light on the object surface and provide the color difference value between the sample and the standard sample; S4: Macroscopic observation. Place the treated sample under a microscope to observe the details of the staining, and check for phenomena such as uneven color, particle attachment, and staining spots. By observing through a microscope, it can be judged whether the gray staining is uniform and whether there is local over-staining; S5: Washing test. Wash the treated sample with water. Prepare warm water at 30 - 45 degrees Celsius and a cleaning agent. Soak the fabric contaminated with the disinfectant in the warm water, and rub it for 5 - 10 minutes after 10 - 15 minutes. Observe the color change of the sample after washing and whether there is residual gray staining. If the color of the sample after washing is significantly weakened or the gray staining phenomenon is removed, it indicates a weak gray staining ability of the disinfectant. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the degree of gray staining is high; S6: Color fastness test. Use a standard color fastness test method to test the wash fastness of the treated sample and evaluate the color fastness of the sample under standard conditions. If the sample fades significantly or shows gray staining after washing, it indicates a high degree of gray staining.

[0022] Through the above qualitative evaluation method, the dyeing performance of the disinfectant solution is evaluated according to the graying effect of phthalaldehyde in the disinfectant solution, and a comprehensive evaluation is carried out by combining multiple methods.

[0023] Referring to Figure 1 , Example 5 In this example, a qualitative evaluation method for the graying degree of phthalaldehyde disinfectant solution is proposed, including the following steps: S1: Visual observation. Coat or spray the solution containing phthalaldehyde in the disinfectant solution on the surface of the sample, usually a fiber or other dyeable material, and let it dry naturally or perform appropriate drying treatment. Observe whether there is graying on the surface (i.e., irregular dyeing, dull color or spots). If the surface of the sample becomes uneven or obvious graying spots appear, it indicates a higher graying degree of the disinfectant solution. If the surface color changes evenly and is lighter, it indicates a lower graying degree or no graying phenomenon. S2: Spectral reflection. Measure the reflection spectrum of the treated sample surface with a spectrophotometer or other spectral analysis instruments, and compare the reflection spectrum differences between the untreated and treated samples. The change in the reflection spectrum reflects the degree of color change of the sample. If the color depth increases or obvious color deviation appears, it indicates a stronger graying effect of the disinfectant solution. The spectral reflection method is a reliable technique that can accurately evaluate the color change of materials after being treated with disinfectant solutions or other chemicals, especially playing an important role in the qualitative and quantitative evaluation of the graying degree. By analyzing the reflection spectrum, the graying situation and its severity of the sample can be effectively judged. S3: Color difference meter measurement. Measure the surface color of the sample treated with the disinfectant solution using a color difference meter, and record the values of its brightness, red-green degree, and yellow-blue degree. The color difference meter measurement method is a technique commonly used for quantitative analysis of color differences in objects. By measuring the color of the sample surface and comparing it with a standard sample, the degree of color change is determined. This method is commonly used in quality control, color consistency inspection, and dyeing effect evaluation of various products. The color difference meter can accurately measure the color of the reflected light on the object surface and provide the color difference value between the sample and the standard sample. S4: Macroscopic observation. Place the treated sample under a microscope to observe the details of the dyeing, and check for phenomena such as uneven color, particle attachment, and dyeing spots. By observing under a microscope, it can be judged whether the graying is uniform and whether there is local over-dyeing. S5: Cleaning test. The treated samples are washed with water. Prepare warm water at 30 - 45 °C and a cleaning agent. Soak the cloth contaminated with the disinfectant in the warm water. After 10 - 15 minutes, rub it for 5 - 10 minutes. Observe the color change of the sample after washing and whether there is residual gray staining. If the color of the sample after cleaning is significantly weakened or the gray staining phenomenon is removed, it indicates that the gray staining ability of the disinfectant is weak. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the degree of gray staining is high; S6: Colorfastness test. Use the standard colorfastness test method to test the wash fastness of the treated samples and evaluate the colorfastness of the samples under standard conditions. If the samples fade significantly or show gray staining after washing, it indicates a high degree of gray staining.

[0024] Through the above qualitative evaluation method, evaluate the dyeing performance of the disinfectant according to the gray staining effect of phthalaldehyde in the disinfectant, and conduct a comprehensive evaluation by combining multiple methods.

[0025] Compare the conventional qualitative evaluation method of gray staining degree with the qualitative evaluation method of gray staining degree prepared in Examples 1 - 5. The results of Examples 1 - 5 are as follows in the table:

[0026] As can be seen from the above table, the qualitative evaluation method of the gray staining degree of a phthalaldehyde disinfectant proposed by the present invention has been significantly improved, and Example 1 is the best example.

[0027] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A qualitative evaluation method for the graying degree of o-phthalaldehyde disinfectant solution, characterized in that, It includes the following steps: S1: Visual observation; S2: Spectral reflection; S3: Color difference meter measurement; S4: Macroscopic observation; S5: Cleaning test; S6: Color fastness test.

2. The qualitative evaluation method for the graying degree of o-phthalaldehyde disinfectant solution according to claim 1, characterized in that, In the S1 step, a solution containing o-phthalaldehyde in the disinfectant is coated or sprayed on the surface of the specimen, usually a fiber or other dyeable material, and allowed to dry naturally or subjected to appropriate drying treatment. Observe whether there is gray staining on the surface (i.e., irregular staining, dull color or spots). If the surface of the specimen becomes uneven or obvious gray staining spots appear, it indicates a higher degree of gray staining of the disinfectant. If the surface color changes evenly and is lighter in color, it indicates a lower degree of gray staining or no gray staining phenomenon.

3. The qualitative evaluation method for the degree of grey staining of o-phthalaldehyde disinfectant solution according to claim 1, wherein, In the S2 step, a spectrophotometer or other spectral analysis instrument is used to measure the reflection spectrum of the surface of the treated sample, and the difference in the reflection spectra of the untreated and treated samples is compared. The change in the reflection spectrum reflects the degree of color change of the sample. If the color depth increases or obvious color deviation appears, it indicates a stronger gray staining effect of the disinfectant.

4. A qualitative evaluation method for the degree of greying of o-phthalaldehyde disinfectant solution according to claim 1, characterized in that, In the S3 step, a color difference meter is used to measure the surface color of the sample treated with the disinfectant, and the values of its brightness, red-green degree and yellow-blue degree are recorded.

5. A qualitative evaluation method for the degree of greying of o-phthalaldehyde disinfectant solution according to claim 1, characterized in that, In the S4 step, the treated sample is placed under a microscope for observation to check the details of the staining, and observe whether there are phenomena such as uneven color, particle attachment, staining spots, etc. Through microscopic observation, it can be judged whether the gray staining is uniform and whether there is local over-dyeing, etc.

6. A qualitative evaluation method for the graying degree of o-phthalaldehyde disinfectant solution according to claim 1, characterized in that In the S5 step, the treated sample is washed with water. Prepare warm water at 30 - 45 degrees Celsius and a cleaning agent. Immerse the cloth contaminated with the disinfectant in the warm water, and rub it for 5 - 10 minutes after 10 - 15 minutes. Observe the color change of the sample after washing and whether there is residual gray staining phenomenon. If the color of the sample after cleaning is significantly weakened or the gray staining phenomenon is removed, it indicates that the gray staining ability of the disinfectant is weak. If the color remains unchanged after washing, it may indicate that the dye has been deeply fixed and the degree of gray staining is high.

7. A qualitative evaluation method for the degree of grey staining of o-phthalaldehyde disinfectant solution according to claim 1, characterized in that, In the S6 step, a standard color fastness test method is used to test the wash fastness of the treated sample, and the color fastness of the sample under standard conditions is evaluated. If the sample fades significantly or produces gray staining after washing, it indicates a high degree of gray staining.

8. A qualitative evaluation method for the graying degree of o-phthalaldehyde disinfectant solution according to claim 1, characterized in that, Through the above qualitative evaluation method, the staining performance of the disinfectant is evaluated according to the gray staining effect of o-phthalaldehyde in the disinfectant, and a comprehensive evaluation is carried out by combining multiple methods.

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