Method for testing waterproof performance of a cosmetic product

Abstract

The application discloses a kind of test methods of waterproof performance of color cosmetic product, comprising the following steps: data acquisition before use: select test area and mark on the skin of subject, collect the brightness value, red-green value, yellow-blue value, individual type angle, roughness and smoothness of test area;Pre-bath data acquisition: test sample is evenly coated on the test area of subject, and the relevant parameters of test area are collected;Water resistance test;Post-bath data acquisition: the relevant parameters of test area are collected;Data statistics: the statistical analysis of data is carried out using application statistical analysis software;Result determination: any parameter in instrument test relevant parameter after bath is not significantly changed compared with before bath, or significantly changed compared with before use, then it is determined that test sample has waterproof effect, otherwise it is considered that test sample has no waterproof effect.The application provides objective measurement data of two dimensions of skin color and skin texture for evaluating the waterproof performance of color cosmetic product, which is more reasonable and has more reference value.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of waterproof performance test, and particularly relates to a test method for waterproof performance of a color cosmetic product. BACKGROUND

[0002] Waterproof performance is an important index of a color cosmetic product, that is, the product can still maintain certain efficacy under the condition of immersion or swimming in sweat. However, the current waterproof performance test method for a cosmetic product mainly relies on subjective evaluation of a subject, and has limited reference value. The objective measurement method is only applicable to sunscreen products, and the applicable product types are extremely limited. Therefore, there is an urgent need for a test method for waterproof performance of a color cosmetic product which can solve the above problems. SUMMARY

[0003] In view of the above technical problems, the application provides a test method for waterproof performance of a color cosmetic product, which evaluates the waterproof efficacy of the cosmetic product by testing the test sample by a subject and detecting by an instrument.

[0004] The technical scheme of the application is as follows:

[0005] The application provides a test method for waterproof performance of a color cosmetic product, which comprises the following steps:

[0006] S1, collecting data before use: selecting and marking a test area on the skin of a subject, and collecting the brightness value L*0, the red-green value a*0, the yellow-blue value b*0 and the individual type angle ITA°0 of the test area by operating a facial imaging system, and collecting the roughness SEr0 and the smoothness Sesm0 of the test area by operating a skin surface texture analysis system;

[0007] S2, collecting data before bathing: uniformly applying a test sample to the test area of the subject, collecting the brightness value L*1, the red-green value a*1, the yellow-blue value b*1 and the individual type angle ITA°1 of the test area by operating the facial imaging system, and collecting the roughness SEr1 and the smoothness Sesm1 of the test area by operating the skin surface texture analysis system;

[0008] S3, waterproof resistance test: the subject performs a waterproof resistance test;

[0009] S4, collecting data after bathing: collecting the brightness value L*2, the red-green value a*2, the yellow-blue value b*2 and the individual type angle ITA°2 of the test area by operating the facial imaging system, and collecting the roughness SEr2 and the smoothness Sesm2 of the test area by operating the skin surface texture analysis system;

[0010] S5, data statistics: using application statistical analysis software to statistically analyze the data, normal distribution test is performed on the pre-use data, pre-bath data and post-bath data, if the test data is normally distributed, t-test method is used for statistical analysis; if the test data is not normally distributed, rank sum test is used; the significance level of statistical analysis is a = 0.05;

[0011] S6, result determination: if any of the instrument test parameters after bathing is not significantly changed compared with before bathing, or is significantly changed compared with before use, it is determined that the test sample has waterproof effect, otherwise it is considered that the test sample has no waterproof effect.

[0012] Among them, the test related parameters include L* value, a* value, b* value, ITA° value, roughness SEr and smoothness Sesm;

[0013] L* value: skin brightness, the larger the value, the more the color is biased towards white;

[0014] a* value: the larger the value, the more red the skin represents;

[0015] b* value: the larger the value, the more yellow the skin represents;

[0016] ITA° value: represents the whiteness of the skin, the larger the ITA°, the lighter the skin color;

[0017] Roughness SEr: the smaller the value, the rougher the skin;

[0018] Smoothness SEsm: the smaller the value, the smoother the image.

[0019] Preferably, the subjects are healthy men / women aged 18-60 years, ensuring that the effective number is at least 30.

[0020] Preferably, the facial imaging system uses VISIA-CR, and the skin surface texture analysis system uses VC 20plus. Canfield VISIA-CR facial image analyzer has multiple light source modes: standard light, UV light, cross-polarized light, and parallel-polarized light, which can accurately analyze the changes in skin color of the subjects before and after bathing. The skin surface texture analysis system Visioscan VC 20plus is suitable for efficacy detection of cosmetics on roughness and skin surface morphology, providing objective measurement data for the evaluation of waterproof performance from two dimensions of skin color and texture, and is suitable for various scenes, claims and categories.

[0021] Preferably, in the S1 step, the test area is located on the inner side of the arm of the subject, and the number is at least 1, and the area of each test area is at least 3cm x 3cm.

[0022] Preferably, in the S2 step, the application amount of the test sample is (2.0+0.1) mg / cm2 .

[0023] Preferably, the water resistance test is a general water resistance test (generally, only using the objective terms such as "waterproof", "sweatproof", etc. can be regarded as claiming general waterproof performance), including the following steps: a) after applying the test sample as required, bathing in water for 20 minutes; b) resting out of water for 20 minutes; c) bathing in water again for 20 minutes; wherein during the bathing test, the test area is always immersed in water, and the flow rate of the water flow relative to the subject is 0.02-0.05 m / s, and during the resting out of water, the test area is not wiped with a towel.

[0024] Preferably, the water resistance test is a strong water resistance test (using subjective terms such as "highly waterproof and sweatproof", specific use scenario terms such as "suitable for outdoor activities such as swimming", or other similar terms, which can be regarded as claiming strong waterproof performance), including the following steps: a) after applying the sample as required, bathing in water for 20 minutes; b) resting out of water for 20 minutes; c) bathing in water again for 20 minutes; d) resting out of water for 20 minutes; e) bathing in water again for 20 minutes; f) resting out of water for 20 minutes; g) bathing in water again for 20 minutes; wherein during the bathing test, the test area is always immersed in water, and the flow rate of the water flow relative to the subject is 0.02-0.05 m / s, and during the resting out of water, the test area is not wiped with a towel.

[0025] Preferably, the bath used in the water resistance test is an indoor pool, a rotating or water flow bathtub, the water temperature is maintained at 23-32℃, and the water quality meets the health and safety requirements. During the water resistance test, the circulating water outlet cannot be directly aimed at the test site.

[0026] The beneficial effects of the present application are:

[0027] The present application provides a test method for the waterproof performance of a color cosmetic product, which provides objective measurement data in two dimensions of skin color and skin texture for evaluating the waterproof performance of a color cosmetic product, which is more reasonable and has more reference value. In addition, the water resistance test of the present application can be divided into a general water resistance test and a strong water resistance test, and the appropriate method can be selected according to the requirements of the color cosmetic product, and the test method is more in line with the actual situation, and the test result is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in conjunction with the drawings and examples:

[0029] Figure 1 is the picture of subject 1 before using the test sample eyebrow pencil, before bathing, and after bathing;

[0030] Figure 2 is the picture of subject 2 before using the test sample eyebrow pencil, before bathing, and after bathing;

[0031] Figure 3 Figure 3 is a picture of subject 3 for the test sample before eyebrow pencil use, before bath, and after bath. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with specific embodiments and with reference to the drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0033] Test requirements

[0034] (1) Environmental conditions

[0035] The evaluation and instrument testing of the researchers during the test should be carried out in an environment with a temperature of 21±1℃ and a relative humidity of 50±10% RH, and the subjects should be adapted to this environment for at least 30 minutes before the evaluation and testing.

[0036] (2) Selection of subjects

[0037] Inclusion criteria

[0038] a) Healthy female / male, aged 18-60 years old;

[0039] b) Able to cooperate well with the test and maintain the regularity of life during the study period;

[0040] c) Able to read and understand all the contents of the informed consent form and voluntarily sign the informed consent form;

[0041] d) Agree not to use any cosmetics, drugs and health products that may affect the results during the test period.

[0042] Exclusion criteria

[0043] a) Used antihistamines within the past week or immunosuppressants within the past month;

[0044] b) Applied any anti-inflammatory drugs to the test site within the past two months;

[0045] c) Subject with clinically unhealed inflammatory skin disease;

[0046] d) Insulin-dependent diabetic patients;

[0047] e) Patients with asthma or other chronic respiratory diseases undergoing treatment;

[0048] f) Received anti-cancer chemotherapy within the past 6 months;

[0049] g) Patients with immunodeficiency or autoimmune disease;

[0050] h) Lactating or pregnant women;

[0051] i) Patients who have undergone bilateral mastectomy and bilateral axillary lymph node dissection;

[0052] j) Patients whose skin at the test site is affected by scarring, pigmentation, atrophy, port wine stains, uneven skin tone, folliculitis or other blemishes that would affect the interpretation of the test results;

[0053] k) Patients participating in other clinical trial studies.

[0054] l) Patients who have participated in other clinical trials, including patch tests, within the last two months or are within the washout period for the test;

[0055] m) Patients with highly sensitive constitutions.

[0056] n) Non-volunteers or patients who cannot complete the required procedures as required by the trial.

[0057] Preparation before the test

[0058] The test site should not have been treated with any product (cosmetic or topical medication) for 2-3 days before the test and should not have been in contact with water for 1-3 hours. Before the test, the subject should clean the inner forearm of both hands.

[0059] The inner forearm of the subject should be marked with the measurement area, with an area of at least 3 cm x 3 cm. Multiple areas can be marked on the same arm, with at least 1 cm between each test area.

[0060] The subject should sit in a room that meets the standards for at least 30 minutes before the formal test, without drinking water or beverages. The forearm should be exposed and placed in the test position, remaining relaxed.

[0061] Test procedure

[0062] 1. Before use

[0063] (1) Enroll eligible volunteers according to the recruitment requirements, sign the written informed consent form, and ask the subject a series of questions about disease history, health status, etc. before enrollment, in accordance with the inclusion and exclusion criteria, and conduct a compliance assessment and screening of the skin condition of the test site and record it;

[0064] (2) Clean the test site and wait: the subject should clean the face with a dry paper towel and sit in a laboratory with a temperature of 21℃±1℃ and a relative humidity of 50%±10% for 30 minutes;

[0065] (3) Before use data collection: Mark the inner side of the arm: the laboratory technician selects 1 area mark on the inner side of the left arm, and the area is 3 cm x 3 cm; the laboratory technician operates the facial imaging system VISIA-CR to collect the brightness value L*0, the red-green value a*0, the yellow-blue value b*0 and the individual type angle ITA°0 of the test area, and operates the skin surface texture analysis system VC20plus to collect the roughness SEr0 and the smoothness Sesm0 of the test area;

[0066] (4) The laboratory technician guides the subject to use the product according to the product use requirements and the use site. The test sample in this embodiment is a brow cream.

[0067] 2. Before bathing

[0068] (1) Before bathing data collection: The laboratory technician applies the test sample to the marked area on the inner side of the subject's arm according to the sample use requirements, with an amount of (2.0+0.1) mg / cm 2 , and operates the facial imaging system VISIA-CR to collect the brightness value L*1, the red-green value a*1, the yellow-blue value b*1 and the individual type angle ITA°1 of the test area, and operates the skin surface texture analysis system VC20plus to collect the roughness SEr1 and the smoothness Sesm1 of the test area;

[0069] (2) The laboratory technician checks the subject's compliance.

[0070] In addition, if the subject's skin has an adverse reaction during the use of the test sample, the test should be terminated immediately, and the subject should be given appropriate medical treatment. The adverse reaction should be recorded.

[0071] 3. Water resistance test

[0072] According to the requirements, general water resistance test (usually, only use "waterproof", "sweatproof" and other objective terms, which can be regarded as claiming general water resistance) and strong water resistance test (use "highly waterproof and sweatproof", "suitable for swimming and other outdoor activities" and other specific use site terms, or other similar terms, which can be regarded as claiming strong water resistance) are selected. The test procedure of the general water resistance test is: a) after applying the test sample as required, bathing in water for 20 minutes; b) rest for 20 minutes after getting out of the water; c) get into the water and test for 20 minutes. The test procedure of the strong water resistance test is: a) after applying the sample as required, bathing in water for 20 minutes; b) rest for 20 minutes after getting out of the water; c) get into the water and test for 20 minutes; d) rest for 20 minutes after getting out of the water; e) get into the water and test for 20 minutes; f) rest for 20 minutes after getting out of the water; g) get into the water and test for 20 minutes.

[0073] The test sample in this example is an eyebrow pencil. The general water resistance test is performed on the subjects, ensuring that the inner side of the subject's forearm does not touch the edge of the pool, and ensuring that the test area is always immersed in water. The specific process is as follows:

[0074] (1) After applying the sample as required, test in the pool for 20 minutes, with a water flow rate of 0.05 m / s in the pool, and the circulating outlet cannot be directly against the test area;

[0075] (2) Take a 20-minute break (do not use a towel to test the test area);

[0076] (3) Enter the water and test again for 20 minutes, with a water flow rate of 0.05 m / s in the pool, and the circulating outlet cannot be directly against the test area.

[0077] 4. After bathing

[0078] After bathing data collection: After the water resistance test is completed, rest for 20 minutes in the test environment until the arm skin is dry; the tester operates the instrument to collect the post-bathing skin data of the subject, specifically operating the facial imaging system VISIA-CR to collect the brightness value L*2, the red-green value a*2, the yellow-blue value b*2 and the individual type angle ITA°2 of the test area, and operating the skin surface texture analysis system VC 20plus to collect the roughness SEr2 and the smoothness Sesm2 of the test area. After the test is completed, the subject leaves the laboratory.

[0079] As shown in Figures 1 to 3 , the pictures before use, before bathing and after bathing of three subjects (subject 1 corresponds to number 371, subject 2 corresponds to number 1559, and subject 3 corresponds to number 1774) for the test sample eyebrow pencil.

[0080] As shown in Table 1 below, the data of the individual type angle ITA° at different time points, which is the data of 33 subjects, is expressed as the average value plus or minus the standard deviation. As shown in Table 2, the change rate of the individual type angle ITA°.

[0081] Table 1 Data of Individual Type Angle ITA° at Different Time Points

[0082] Test sample Before use Before bath After bath Eyebrow pencil 70.12±10.88 23.83±11.82 24.35±13.83

[0083] Table 2 Change Rate of Individual Type Angle ITA°

[0084] Sample name Before bath After bath Test sample -66.02％ -65.27％

[0085] 6. Data Statistics

[0086] The statistical analysis software is used to statistically analyze the data, normal distribution test is performed on the test data, if the test data is normal distribution, t-test method is used for statistical analysis, if the test data is non-normal distribution, rank sum test is used, and the significance level of statistical analysis is a=0.05.

[0087] 7. Result determination

[0088] If any parameter in the related parameters of the post-bath instrument test is not significantly changed compared with the pre-bath, or is significantly changed compared with the pre-use, it is determined that the test sample has waterproof effect, otherwise it is considered that the test sample has no waterproof effect. The test results of the individual type angle ITA ° value are shown in Table 3 as follows:

[0089] Table 3 Test results of individual type angle ITA ° value

[0090]

[0091] The significance annotation method is as follows: "n.s." represents no statistical difference, P>0.05; "*" represents significant difference, 0.01≤P<0.05; "**" represents very significant difference, 0.001≤P<0.01; "***" represents extremely significant difference, P<0.001. "N" represents the number of users=33.

[0092] From the test results of the individual type angle ITA ° value, it can be seen that the individual type angle ITA ° value of the arm after using the test sample for bathing has extremely significant difference compared with the pre-use (P<0.001); the individual type angle ITA ° value of the arm after using the test sample for bathing has no statistical difference compared with the pre-bath (P>0.05); it is judged that the eyebrow pencil of the test sample has waterproof effect.

[0093] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A method for testing the waterproof performance of a product of the make-up class, characterized in that, Comprising the following steps: S1, pre-use data collection: select and mark the test area on the skin of the subject, operate the facial imaging system to collect the brightness value L*0, red-green value a*0, yellow-blue value b*0 and individual type angle ITA°0 of the test area, and operate the skin surface texture analysis system to collect the roughness SEr0 and smoothness Sesm0 of the test area; S2, pre-bath data collection: evenly apply the test sample to the test area of the subject, operate the facial imaging system to collect the brightness value L*1, red-green value a*1, yellow-blue value b*1 and individual type angle ITA°1 of the test area, and operate the skin surface texture analysis system to collect the roughness SEr1 and smoothness Sesm1 of the test area; S3, water resistance test: the subject performs the water resistance test, which is divided into general water resistance test and strong water resistance test, and is selected according to the requirements of the color cosmetic product; In the water resistance test, the bath is an indoor pool, a rotating or water flow bathtub, the water temperature is maintained at 23-32°C, and the water quality meets the health and safety requirements; S4, post-bath data collection: operate the facial imaging system to collect the brightness value L*2, red-green value a*2, yellow-blue value b*2 and individual type angle ITA°2 of the test area, and operate the skin surface texture analysis system to collect the roughness SEr2 and smoothness Sesm2 of the test area; S5, data statistics: use statistical analysis software to statistically analyze the data, perform normal distribution test on the pre-use data, pre-bath data and post-bath data, if the test data is normally distributed, use t-test method for statistical analysis; if the test data is not normally distributed, use rank sum test; the significance level of statistical analysis is α=0.05; S6, result determination: if any parameter in the post-bath instrument test related parameters is not significantly changed compared with the pre-bath, or is significantly changed compared with the pre-use, it is determined that the test sample has water-proof effect, otherwise it is considered that the test sample has no water-proof effect; The test related parameters include L* value, a* value, b* value, ITA° value, roughness SEr and smoothness Sesm.

2. The method for testing waterproof performance of a color cosmetic product according to claim 1, characterized in that, The subjects are healthy men / women aged 18-60 years old, and the effective number is guaranteed to be at least 30.

3. The method for testing waterproof performance of a color cosmetic product according to claim 1, characterized in that, The facial imaging system uses VISIA-CR, and the skin surface texture analysis system uses VC 20plus.

4. The method for testing waterproof performance of a color cosmetic product according to claim 1, characterized in that, In the S1 step, the test area is located on the inner side of the arm of the subject, and the number is at least 1, and the area of each test area is at least 3cm×3cm.

5. The method for testing waterproof performance of a color cosmetic product according to claim 1, characterized in that, In the S2 step, the coating amount of the test sample is (2.0 + 0.1) mg / cm 2 .

6. The method for testing waterproof performance of a color cosmetic product according to claim 1, characterized in that, The water resistance test is a general water resistance test, comprising the following steps: a) after applying the test sample as required, bathing in water for 20 minutes; b) rest for 20 minutes after getting out of the water; c) get into the water and bathe for 20 minutes again; wherein during the bathing test, the test area is always immersed in water, the water flow speed relative to the subject is 0.02-0.05m / s, and during the rest after getting out of the water, do not wipe the test area with a towel.

7. The method for testing waterproof performance of a color cosmetic product according to claim 1, characterized in that, The water resistance test is a strong water resistance test, comprising the following steps: a) after applying the sample as required, bathing in water for 20 minutes; b) resting out of water for 20 minutes; c) bathing in water again for 20 minutes; d) resting out of water for 20 minutes; e) bathing in water again for 20 minutes; f) resting out of water for 20 minutes; g) bathing in water again for 20 minutes; wherein during the bathing test, the test area is always immersed in water, and the flow rate of the water flow relative to the subject is 0.02-0.05 m / s, and during the resting out of water, the test area is not wiped with a towel.

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