First, the market status
At present, the market demand for whitening cosmetics continues to rise, and the cosmetics industry with whitening effect has become one of the most demanding cosmetics for consumers, and has also become the main product of major brands. The products on the market are dazzling, fiercely competitive, and there are many exaggerated words in the gorgeous and dazzling claims. When consumers buy such products, they mainly choose through the efficacy of product claims. The exaggerated claims will directly affect consumers. Interests.
With the increasing market demand for such products, the efficacy of cosmetics as an important indicator of product quality has attracted widespread attention from relevant departments and consumers in China. Objectively and scientifically evaluating the whitening effect of cosmetics can provide consumers with more complete and accurate information, which has important practical significance for guiding consumption, popularizing common sense and protecting consumers' legitimate rights and interests. In response to the current market situation and consumer demand, the China Consumers Association commissioned the China Academy of Inspection and Quarantine to evaluate the efficacy of 20 samples that were randomly purchased from the market and claimed to have whitening function.
Second, the basis of testing
The EEMCO guidance for the assessment of skin colour is widely used in cosmetics whitening efficacy provided by the European Expert Group on Efficacy Measurement of Cosmetics and other Topical Products (EEMCO). evaluation of. In recent years, the color gradation system specified by the International Commission on Illumination (CIE) has been widely used in foreign countries to measure skin color changes.
Based on human trials, this comparative test tests and analyzes the changes in skin color before and after the use of the product by means of instrument testing and consumer self-assessment, thereby objectively and scientifically evaluating the whitening efficacy of the product. The trial number of each product is 30, and the product life cycle is 4 weeks. The test was conducted from March to May. During this period, the sunshine, ultraviolet intensity and temperature increased rapidly. These external factors will have an important impact on the skin color and product use. Therefore, the above factors are fully considered. In this case, set the face and arm as the product use area and test area, and set the control area on the arm (without using the product) to test the effect of the skin's own changes on the skin tone.
Skin color is measured using an internationally accepted skin color meter. The Lab Color System, specified by the International Commission on Illumination (CIE), is used to analyze changes in human skin color before and after use of the product, including L*, a*, b*, ITA°. , ΔE five parameters *, the comprehensive evaluation of these parameters shows the position of the color in the color space, reflecting the multi-dimensional changes in the skin color space, so that the chromaticity changes are expressed in the form of numerical values, quantifiing the changes in the skin chromaticity, thereby evaluating the whitening The efficacy of the product.
Consumer self-assessment is an important part of the evaluation of cosmetic efficacy, complementing instrumental testing. In this test, a questionnaire survey was conducted to conduct a comprehensive and systematic investigation on various aspects such as skin color and brightness after use, which provided a useful supplement for objective evaluation of product effects.
*: L is the brightness. The larger the value, the more the color is white, and the other is black. a is red and green, +a is the red direction, and -a is the green direction. b is yellow and blue, +b is yellow, -b is blue, ITA is chromatic individual type angle, which is the composite index of reaction L and b. The larger the value, the brighter the skin color. ΔE is the color difference and is a composite index of L, a, and b.
Third, the inspection project
1 skin color
2 consumer self-assessment
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