Image restoration and protection agent for residual black and white photos in archives

Abstract

The present invention discloses a restoring and protecting agent for residual black and white photograph images in an archive book, which is composed of the following components in percentage by mass: 3% to 5% ethyl cellulose, 5% to 20% emulsifier OP‑10, 1% to 7% diphenyl isooctyl phosphate, and 100% banana water. The emulsifier OP‑10 in the restoring and protecting agent of the present invention is a non-ionic surfactant, which can reduce the surface tension of the liquid, making the liquid easier to wet and penetrate, and has good wetting and diffusion properties. The restoring and protecting agent is applied to the residual emulsion layer in the archive book, which can effectively fill the larger rough interface generated by the barium stratum and a small amount of fiber, eliminate the light scattering phenomenon, and restore the original appearance of the recorded image. Compared with the existing visualization and reinforcement agent, the restoring and protecting agent of the present invention has better penetration and diffusion effect, has excellent visualization effect for the blurred image caused by the larger rough interface on the surface of the photo, and can clearly show the original appearance of the photo.

Description

Technical Field

[0001] The invention belongs to the technical field of archive restoration and protection, relates to the restoration of residual black-and-white photo images in archive books, and particularly relates to a protective agent for restoring residual black-and-white photo images in archive books. Background Art

[0002] Some archival files contain photographs, particularly early personnel files, which contained personal ID photos in the form of 1-inch or 2-inch black-and-white, light-sensitive silver halide prints. During the storage process, these files were exposed to adverse environmental factors such as high temperature and humidity, causing the materials that make up the photographs to age and degrade. The gelatin in the emulsion layer of the photographs degraded and became sticky. Furthermore, the external forces applied during storage could easily cause the photographs to adhere to the paper within the file. During the opening of the file, the emulsion layer separated from the paper base, causing the emulsion layer to adhere to the contacting paper surface. The photographic image layer was trapped between the paper and the barium layer, obscured by the barium layer and rendered unreadable. Research has found that the obscured image is caused by a rough interface formed by the residual barium layer and a small amount of fiber on the emulsion layer's surface. This results in an uneven medium for the incident light, causing light scattering and preventing the incident light from penetrating below the interface. Consequently, the original image observed by the naked eye becomes blurred.

[0003] Zhao Yanhong et al. invented a black-and-white photographic visualization and reinforcement agent based on bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and diphenyl isooctyl phosphate to restore the image information recorded in photographs. This method utilizes the synergistic effect of the non-volatile liquid stabilizers bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and diphenyl isooctyl phosphate with the polymer reinforcement material to eliminate light scattering, thereby clearly revealing the original appearance of damaged black-and-white photographs. This method is effective in revealing blurred and faded images caused by photographic defects such as mildew, silver mirrors, and loose and powdery emulsion layers. However, when this visualization and reinforcement agent was applied to the barium layer on the surface of the residual emulsion layer in archives, it was found that the penetration of the agent was poor, and the image information in thicker areas was not revealed, thus failing to clearly reveal the original appearance of the photograph. This is because mildew, silver mirror, loose emulsion layer and other defects all occur in the emulsion layer which is only a dozen microns thick, while the thickness of the barium layer covering the residual emulsion layer and the paper fibers mixed therein are much larger than that. Accordingly, the rough interface caused by the barium layer and the mixed paper fibers is larger than the rough interface of blurred and faded photos caused by mildew, silver mirror, loose emulsion layer and so on. Summary of the Invention

[0004] In order to restore the residual black and white photographic emulsion layer images in archives, the present invention proposes a restoration and protection agent with emulsifier OP-10 and diphenyl 2-ethylhexyl phosphate as main ingredients. When applied to the residual emulsion layer in the archive, it can effectively fill the large rough interface caused by the barium layer and a small amount of fiber, eliminate light scattering, and restore the original appearance of the recorded image.

[0005] The invention provides a restoring and protecting agent for residual black and white photos in archives, which comprises the following components by weight: 3% to 5% ethyl cellulose, 5% to 20% emulsifier OP-10, 1% to 7% diphenyl isooctyl phosphate, and banana oil added to 100%.

[0006] Furthermore, the weight percentage composition of the residual black and white photo image restoration and protection agent in the archive is preferably: ethyl cellulose 4%, emulsifier OP-10 5% to 15%, diphenyl ethyl phosphate 1% to 7%, and banana oil added to 100%.

[0007] The preparation method of the image restoration and protection agent for residual black-and-white photographs in an archive book comprises the following steps: adding ethyl cellulose to banana water, heating and refluxing at 110-120° C. under stirring conditions until the ethyl cellulose is completely dissolved, then stopping the heating and refluxing, adding an emulsifier OP-10 and diphenyl isooctyl phosphate after cooling to room temperature, and performing ultrasonic vibration to uniformly obtain the image restoration and protection agent for residual black-and-white photographs in an archive book.

[0008] The method for using the image restoration and protection agent for residual black and white photos in the archive book of the present invention is: dip the image restoration and protection agent with a soft brush or a flatly rolled absorbent cotton, roll it on the back of the residual black and white photo emulsion layer to be restored, evenly apply a layer, and let it dry naturally after application.

[0009] The beneficial effects of the present invention are as follows:

[0010] The emulsifier OP-10 in the restoration and protection agent of this invention is a nonionic surfactant that reduces the surface tension of liquids, making them easier to wet and penetrate, and exhibits excellent wetting and diffusion properties. Compared with existing visualization and reinforcement agents, this restoration and protection agent has a better penetration and diffusion effect. It has an excellent visualization effect on blurred images caused by large rough surfaces on photographic surfaces, clearly revealing the original appearance of photos. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of a black-and-white photograph (left) and the residual emulsion layer in the archive (right).

[0012] Figure 2 It is the XRD pattern of the surface covering of the residual emulsion layer.

[0013] Figure 3Here are the infrared spectra of gelatin, paper, and the residual emulsion layer surface covering.

[0014] Figure 4 Scanning electron micrographs of a newly produced photograph (a) and the surface of the residual emulsion layer in the archive (b).

[0015] Figure 5 It is the surface morphology and roughness parameters of the residual emulsion layer before and after it is repaired by coating the surface with a restoration and protective agent.

[0016] Figure 6 These are the mercury advance and retreat curves of the untreated sample and the sample treated with the recovery protectant.

[0017] Figure 7 This is the pore size distribution diagram of the untreated sample and the sample treated with the recovery protective agent.

[0018] Figure 8 It is the visible light reflection spectrum of the residual emulsion layer before and after the surface is coated with a restoration protective agent.

[0019] Figure 9 This is a diagram showing the covering effect of paper treated with existing revealing strengthening agents and restoring protective agents.

[0020] Figure 10 This is a reflection spectrum diagram of paper before and after being treated with existing visualization strengthening agents and restoration protective agents.

[0021] Figure 11 This is a picture showing the effect of restoring the image clarity of the residual emulsion layer in the archive. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and examples, but the protection scope of the present invention is not limited to these examples.

[0023] The emulsifier OP-10 in the following examples was provided by Tianjin Fuyu Fine Chemical Co., Ltd.

[0024] Example 1

[0025] The composition of the residual black-and-white photo image restoration and protection agent in this embodiment is as follows: 4% ethyl cellulose, 14% emulsifier OP-10, 7% diphenyl ethyl phosphate, and banana oil added to 100% by weight. The preparation method is as follows:

[0026] 4 g of ethyl cellulose was added to 75 g of banana water, and the mixture was heated under reflux at 120°C for 2 hours under stirring until the ethyl cellulose was completely dissolved, and then the heating and reflux were stopped. After cooling to room temperature, 14 g of emulsifier OP-10 and 7 g of diphenyl ethyl phosphate were added, and ultrasonic vibration was performed to obtain a protective agent for restoring the residual black and white photos in the archive.

[0027] Example 2

[0028] The composition of the residual black and white photo image restoration and protection agent in the archive of this embodiment is as follows: 4% ethyl cellulose, 5% emulsifier OP-10, 1% diphenyl ethyl phosphate, and banana oil added to 100% by weight. The preparation method is as follows:

[0029] 4 g of ethyl cellulose was added to 90 g of banana water, and the mixture was heated under reflux at 120°C for 2 hours under stirring until the ethyl cellulose was completely dissolved, and then the heating and reflux were stopped. After cooling to room temperature, 5 g of emulsifier OP-10 and 1 g of diphenyl ethyl phosphate were added, and ultrasonic vibration was performed to obtain a protective agent for restoring the residual black and white photos in the archive.

[0030] Example 3

[0031] The composition of the residual black and white photo image restoration agent in the archive of this embodiment is as follows: 4% ethyl cellulose, 10% emulsifier OP-10, 4% diphenyl ethyl phosphate, and banana water added to 100% by weight. The preparation method is as follows:

[0032] 4 g of ethyl cellulose was added to 82 g of banana water, and the mixture was heated under reflux at 120°C for 2 hours under stirring until the ethyl cellulose was completely dissolved, and then the heating and reflux were stopped. After cooling to room temperature, 10 g of emulsifier OP-10 and 4 g of diphenyl ethyl phosphate were added, and ultrasonic vibration was performed to obtain a protective agent for restoring the residual black and white photos in the archive.

[0033] Example 4

[0034] The composition of the residual black and white photo image restoration and protection agent in the archive of this embodiment is as follows: 3% ethyl cellulose, 5% emulsifier OP-10, 1% diphenyl ethyl phosphate, and banana oil added to 100% by weight. The preparation method is as follows:

[0035] 3 g of ethyl cellulose was added to 91 g of banana water, and the mixture was heated under reflux at 120°C for 2 hours with stirring until the ethyl cellulose was completely dissolved, and then the heating and reflux were stopped. After cooling to room temperature, 5 g of emulsifier OP-10 and 1 g of diphenyl ethyl phosphate were added, and ultrasonic vibration was performed to obtain a protective agent for restoring the residual black and white photos in the archive.

[0036] Example 5

[0037] The composition of the residual black and white photo image restoration and protection agent in the archive of this embodiment is as follows: 5% ethyl cellulose, 20% emulsifier OP-10, 7% diphenyl ethyl phosphate, and banana oil added to 100% by weight. The preparation method is as follows:

[0038] Add 5g of ethyl cellulose to 68g of banana water, heat and reflux at 120℃ with stirring for 2 hours until the ethyl cellulose is completely dissolved, then stop heating and reflux. After cooling to room temperature, add 20g of emulsifier OP-10 and 7g of diphenyl ethyl phosphate, and shake evenly with ultrasonic vibration to obtain a protective agent for restoring the residual black and white photos in the archive.

[0039] In order to determine the technical solution of the present invention, the inventors conducted a large number of laboratory research experiments, the specific experiments are as follows:

[0040] 1. Composition and morphology of the surface covering of the residual emulsion layer

[0041] Silver halide black and white photographs are mainly composed of four parts: paper base, barium layer, photosensitive emulsion layer and gelatin protective layer. Figure 1 As shown. Based on the structural composition of the black and white photograph, we speculate that the white covering on the surface of the residual emulsion layer is a barium layer or a combination of a barium layer and a small amount of paper base. In order to determine its composition, a high-resolution X-ray diffractometer and an infrared spectrometer were used to analyze the surface covering of the residual emulsion layer, and its surface morphology was observed using a SEM. The experimental results are shown in the figure. Figure 2 、 Figure 3 and Figure 4 shown.

[0042] Figure 2 This is the XRD pattern of the residual emulsion layer surface covering. Figure 2 It can be seen that the characteristic diffraction peaks of orthorhombic barium sulfate appear at 2θ=25.84°, 26.84°, 28.75°, 31.52°, 32.72° and 42.91°, which correspond to the characteristic diffraction peaks of BaSO4 (021), (210), (121), (211), (002) and (140) crystal planes respectively. It can be inferred that BaSO4 components do exist on the surface of the residual emulsion layer.

[0043] Figure 3 The infrared spectra of gelatin, paper and residual emulsion layer surface samples are shown in Figure 1. -1 The peak near the gelatin is the amide A band, which corresponds to the stretching vibration of -NH and -OH in collagen, located at 2926 cm -1 The weak absorption near 1633 cm is caused by the CN stretching vibration of the amide B band. The amide I band is at 1633 cm -1 The amide II and amide III bands are located at 1539 cm -1 and 1337cm -1Nearby, mainly protein CN stretching vibration and NH bending vibration. From the infrared spectrum of paper, we can see that at 3380cm -1 The absorption peak near 1029cm belongs to the stretching vibration of -OH. -1 The absorption peak near the surface of the residual emulsion layer is caused by the stretching vibration of the C-O-C bond, which is a characteristic peak of cellulose. The infrared spectrum of the sample on the surface of the residual emulsion layer shows that it has both characteristic peaks of gelatin and cellulose, indicating that the surface of the residual emulsion layer is covered with gelatin components and paper.

[0044] Figure 4 Scanning electron microscope images of a fresh photograph (a) and the surface of the residual emulsion layer covering an archival album (b) show the surface of the fresh photograph (a). The images show that the surface of the fresh photograph is smooth, while the surface of the residual emulsion layer in the archival album is uneven. Barium sulfate fills the pores formed by the interwoven fibers, while a large number of pores still exist between the fibers.

[0045] Combining the structural composition of the black and white photos and the above-mentioned XRD, IR and SEM test results, we can conclude that the surface covering of the residual emulsion layer in the archive is composed of a barium layer and a small amount of fiber adhesion.

[0046] 2. Changes in the surface morphology of the residual emulsion layer before and after application of the restoration protective agent

[0047] Figure 5 The surface morphology and roughness parameters of the residual emulsion layer before and after restoration by coating the restoring protective agent of Example 1 on the surface of the residual emulsion layer. Figure 5 (a) is the 2D topography of the residual emulsion layer surface. Figure 5 As can be seen in (a), the surface covering of the residual emulsion layer is composed of barium sulfate and fibers bonded together by gelatin; Figure 5 (b) Figure 5 (a) 3D topography and roughness parameters at the same location, from Figure 5 (b) shows that the surface of the residual emulsion layer is uneven and contains a large number of micron-sized voids, with the surface height fluctuation ranging from -22 to 34 μm. Figure 5 (c) is the 2D morphology of the surface of the residual emulsion layer after the restoration protective agent is applied. Figure 5 As can be seen in (c), after applying the restoring protective agent, the uneven interface disappears and becomes a smooth plane; Figure 5 (d) Figure 5 (c) 3D topography and roughness parameters at the same location, from Figure 5 (d) shows that the surface is relatively smooth after the application of the restoration and protection agent, with the height fluctuation ranging from -1 to 3 μm. Figure 5 (b) with Figure 5From the roughness parameter (d), it can be seen that the arithmetic mean height S of the residual emulsion layer after the surface is coated with the recovery protective agent is a , maximum height S z , aspect ratio S of surface texture tr , the arithmetic mean curvature S of the peak pc , the interface expansion area ratio S dr This is because after applying the restoration and protection agent, the micron-level pores are filled and the surface of the residual emulsion layer becomes smooth and flat from rough.

[0048] 3. Effect of the restoration and protective agent coating on the pore structure of the simulated sample

[0049] Mercury intrusion porosimetry (HIP) is used to test the pore structure of samples before and after filling. Mercury is a non-wetting liquid and can only enter sample pores through pressure. Furthermore, it can test a wide range of pore sizes, resulting in smaller errors and more accurate results. During the pressurization process, smaller sample pores require higher pressure for mercury injection. Using the AutoPore 9500 high-performance fully automatic mercury intrusion porosimeter, a correlation curve can be generated between the volume of mercury entering the sample pores and pressure, pore size, and other parameters. This analysis can yield data such as the sample's porosity and pore size distribution.

[0050] (1) Effect of the sample pore volume before and after coating with the recovery protective agent

[0051] Figure 6 The mercury intrusion and retreat curves of the untreated sample and the sample treated with the recovery protective agent in Example 1 were measured by mercury intrusion experiment. Figure 6 As can be seen in the figure, both the untreated and treated samples have two inflection points in the mercury inlet and outlet curves. The first inflection point is the amount of mercury entering the sealed instrument when it is in the low-pressure chamber of the mercury intrusion instrument. Near this point, the slope of the mercury inlet and outlet curve of the sample is the largest and the rate is the fastest, indicating that the pore size is large and there are many pores in this pressure range. In the high-pressure chamber, as the pressure increases, mercury enters smaller pores. When the curve reaches the second inflection point, as the pressure continues to increase, the mercury inlet of the sample no longer continues to increase and eventually reaches saturation. The saturation value is the pore capacity of the sample. It can be seen from the figure that the pore capacity of the untreated sample is 2.05mL / g, while the pore capacity of the treated sample is 0.84mL / g, which is significantly smaller.

[0052] (2) Effect of the pore size distribution of the sample before and after coating with the recovery protective agent

[0053] The pore size distribution of the untreated sample and the sample treated with the recovery protective agent of Example 1 was analyzed by mercury intrusion method. Figure 7 shown. Figure 7The analysis results show significant differences in the pore size distribution of the samples before and after application of the restorative protective agent. The pore size distribution curve of the untreated sample has three peaks at 5μm, 38μm, and 200μm, and the pore distribution is relatively dense in the 0-38μm range, indicating that the untreated sample has a large number of pores with pore sizes of 5μm and 38μm. However, the pore size distribution curve of the sample treated with the restorative protective agent has only a peak at 38μm, and the number of pores with pore sizes of 5μm and 200μm is significantly reduced. Compared with the untreated sample, the pore size distribution curve area is significantly reduced, indicating that the restorative protective agent has a good pore filling effect.

[0054] (3) Effect of the average pore size and porosity of the sample before and after coating with the recovery protective agent

[0055] The average pore size and porosity of the untreated sample and the sample treated with the restoration and protection agent of Example 1 were analyzed by mercury intrusion, and the results are shown in Table 1. As can be seen from Table 1, the porosity, total pore area, total pore volume, average pore size and skeleton density of the treated sample are significantly reduced compared to the untreated sample. This is because after the sample surface is coated with the restoration and protection agent, its pores are filled and the surface changes from rough to smooth. The surface of the untreated sample is a composite coating formed by barium sulfate and fibers bonded together by gelatin. Barium sulfate fills the pores formed by the interweaving of fibers, but there are still a large number of pores between the fibers, and the roughness is relatively high. Therefore, its average pore size and porosity are much higher than those of the coated sample. After the surface of the untreated sample is coated, the average pore size and porosity are reduced from 807.06nm and 75.02% to 553.12nm and 53.65%, respectively. The surface of the treated sample is better sealed and the porosity is reduced.

[0056] Table 1 Mercury intrusion method test sample pore results

[0057]

[0058] From the above analysis, it can be seen that the pore size distribution and porosity of the sample treated with the restoration and protection agent are significantly reduced, which shows that the restoration and protection agent has a good filling effect on the sample pores, can make the rough surface smooth, and reduce the diffuse reflection of light.

[0059] 4. Changes in visible light reflectance on the surface of the residual emulsion layer before and after application of the restoration protective agent

[0060] Figure 8The figure shows the visible light reflection spectrum of the residual emulsion layer surface before and after restoration by coating the restoration protective agent of Example 1. It can be seen from the figure that the reflectivity of the residual emulsion layer surface to visible light before restoration is between 43% and 58%, while the reflectivity of the residual emulsion layer surface to visible light after restoration is between 8% and 11%. After the residual emulsion layer surface is coated with the restoration protective agent, its reflectivity is significantly reduced. This further illustrates that voids and rough surfaces will cause diffuse reflection of light, shortening the optical path of the incident light, and "visible light cannot penetrate below the interface", and the original appearance of the image observed by the naked eye will be blurred. By coating the restoration protective agent, the voids can be filled, the rough interface can be eliminated, and it can become smoother, reducing the scattering of light, and enhancing the reflection intensity of light, thereby lengthening the wavelength of the incident light, and objects observed by the naked eye will be clearly visible.

[0061] In order to demonstrate the beneficial effects of the present invention, a comparative test was conducted on an existing visualization and strengthening agent (a black and white photo visualization and strengthening agent with bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate and diphenyl isooctyl phosphate as main components) and the restoration and protection agent in Example 2 of the present invention. The specific test is as follows:

[0062] Figure 9 This is a diagram showing the covering effect of paper treated with the existing visualization and reinforcement agent and the restoration and protection agent of Example 2. Figure 9 (a, d) are untreated papers. Figure 9 (b, e) are papers treated with existing enhancement agents. Figure 9 (e, f) show paper treated with the restorative protective agent. Untreated paper and paper treated with different solutions were placed on white paper with the inscription "Hou De Zai Wu" and on a black tabletop. The paper treated with the restorative protective agent, which incorporates the surfactant emulsifier OP-10, exhibited the highest transparency and the best visual effect on the inscription. This demonstrates that the restorative protective agent of this invention has an excellent pore-filling effect, outperforming existing visual enhancement agents.

[0063] The reflectivity of the paper treated with the existing reinforcing agent and the restoring protective agent of Example 2 was tested in the visible light wavelength range using a PerkinElmer Lambda 950 UV-visible near-infrared spectrophotometer. Figure 10. It can be seen from the figure that the reflectivity of the untreated paper in the visible light region is between 29% and 36%, and the reflectivity of the paper treated with the existing visualization reinforcement agent and the restoration protection agent of Example 2 in the visible light region is between 21% and 24% and 9% and 12%, respectively. The reflectivity of the paper treated with the visualization reinforcement agent and the restoration protection agent is significantly lower than that of the untreated paper. This is because the visualization restoration material (bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate, diphenyl isooctyl phosphate, emulsifier OP-10) fills the pores in the paper, making the originally rough surface smoother and flatter, reducing the diffuse reflection of light, and the restoration protection agent of the present invention with the addition of a surfactant has a better penetration and filling effect than the existing visualization reinforcement agent, and its reflectivity is significantly reduced.

[0064] Table 2 shows the whiteness test results of paper treated with the existing developing reinforcement agent and the restoring protective agent of Example 2. Untreated paper and paper treated with different solutions were placed on a black photo, and whiteness tests were performed on different parts of the paper to obtain the average values, and the test results were compared. It can be seen from Table 2 that the whiteness of the untreated paper is 32.3%, and the whiteness of the paper treated with the existing developing reinforcement agent and the restoring protective agent of Example 2 is 24.6% and 12.6%, respectively. The experimental results show that the whiteness of the paper treated with the developing reinforcement agent is significantly reduced, and the whiteness reduction of the restoring protective agent of the present invention is greater than that of the paper treated with the existing developing reinforcement agent. This is because after the paper is coated with the restoring protective agent, the pores between the fibers are filled, and the rough interface becomes relatively smooth and flat, which greatly reduces the scattering of light. The incident light can penetrate deep below the interface and irradiate the black photo, which appears as a reduction in whiteness.

[0065] Table 2 Whiteness test of paper treated with different reagents

[0066] Whiteness (%) 1 2 3 4 average value Unprocessed paper 32 32.5 32.2 32.4 32.3 After treatment with existing visible reinforcement agent 24 24.4 25.1 24.8 24.6 Example 2 Recovery after protective agent treatment 12.7 13.4 12.3 12.1 12.6

[0067] 5. Image clarity restoration of the residual emulsion layer in the archive

[0068] Figure 11 This is the effect diagram of restoring the image clarity of the residual emulsion layer in the archive. Figure 11 (a, c) are photos of Pinghan Railway workers before restoration. From the pictures, we can clearly see that the surface of the image layer is covered by a large area of ​​white coating-like covering, and the image of the people is blurred and unrecognizable. Figure 11 (b, d) are corresponding images of the image restoration effect after application of the restoration and protection agent from Example 1. It can be seen that after the residual emulsion layer is applied with the restoration and protection agent, the image of the person is clearly visible, and the original white overlay on the image layer has essentially disappeared. These experimental results demonstrate that the restoration and protection agent of the present invention has a very good effect on this type of damage.

Claims

1. A protective agent for restoring residual black and white photos in archives, characterized in that: The mass percentage composition of the recovery and protection agent is: 3% to 5% of ethyl cellulose, 5% to 20% of emulsifier OP-10, 1% to 7% of diphenyl isooctyl phosphate, and banana water added to 100%.

2. The image restoration and protection agent for residual black and white photos in archives according to claim 1, characterized in that: The mass percentage composition of the recovery and protection agent is: 4% of ethyl cellulose, 5% to 15% of emulsifier OP-10, 1% to 7% of diphenyl isooctyl phosphate, and banana water added to 100%.

3. The image restoration and protection agent for residual black and white photos in archives according to claim 1, characterized in that: Ethyl cellulose was added to banana water, and the mixture was heated under reflux at 110-120°C with stirring until the ethyl cellulose was completely dissolved, and then the heating and reflux were stopped. After cooling to room temperature, emulsifier OP-10 and diphenyl ethyl phosphate were added, and ultrasonic vibration was performed to obtain a protective agent for restoring the residual black and white photos in the archive.

4. The image restoration and protection agent for residual black and white photos in archives according to claim 1, characterized in that: When using, dip the black and white photo image restoration and protection agent with a soft brush or a flattened absorbent cotton ball, roll it on the back of the residual photosensitive silver salt black and white photo emulsion layer to be repaired, apply a layer evenly, and let it dry naturally after application.

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