First of all, the texture of the product
Human hair is a living fiber. If you observe it under a high-power electron microscope, you will find that its surface layer is composed of countless scales. Although the nutrients needed for hair growth are supplied by the human body through hair follicles, the scaly surface of hair, like leaves, has the functions of breathing and receiving. Proper use of shampoo is good for hair; Otherwise it will damage your hair. Therefore, the texture of shampoo is very important, and we will compare it from the thinness and fragrance.
Thin: Thin refers to the appearance of shampoo, which is the most important part of shampoo texture. Generally, good shampoos are relatively thin in texture, and the activity is not fast after inversion, and the better and thinner the shampoo paste is, there will never be a concave-convex feeling, and the pastes are connected together.
Smell: As the name implies, it is of course the smell of shampoo distribution. Good shampoo makes people feel refreshed, and MM people certainly love it more. The better the shampoo, the lighter the taste, close to the natural taste, such as fruit, light and not blunt nose, lasting fragrance after use.
Second, the gentleness of the product.
The gentleness of shampoo is the PH value of shampoo. PH value is a standard used to distinguish the degree of acidity and alkalinity of substances. Ankang's hair surface has a complete set of hair scales, and normal hair is weakly acidic. If the acidity of shampoo is weaker than that of hair, that is, the PH value of shampoo is higher than that of hair, then the PH value of hair will increase after washing. At this time, the hair scales will open, and the hair is the most fragile and easily damaged. Therefore, acid shampoo should be used to balance the PH value of the two, so that the epidermal scales of the hair will be closed, and the hair will be naturally smooth and easy to comb, healthy and supple.
Third, the foaming ability of the product.
Foaming power is the main sign to identify the quality of shampoo. Under normal circumstances, a good shampoo is easy to foam, and a small amount of water can foam a lot. Therefore, at a certain temperature, we stir the sample diluent in a magnetic stirrer (or directly stir it with a glass rod) for 3 minutes (simulating people to wipe shampoo), and then introduce the sample into the measuring cylinder, so that the foam height can be read directly. The higher the foam height, the better the foaming ability of the product.
Fourth, the detergency of the product.
Decontamination ability is the main sign to evaluate the quality of shampoo, and the most basic function of shampoo is cleaning. It can remove excess grease and dirt from scalp and create a good growth environment for hair. In professional hair care products, shampoo helps to open hair scales for better cleaning, and also helps to close hair scales. The detergency of shampoo depends on its active substance content. Because chloroform can dissolve all surfactants (active substances) but not inorganic salts, we can extract the active substances with chloroform and weigh them again to determine the amount of active substances.
Verb (abbreviation for verb) The repair ability of products.
Hair can be divided into epidermis, cortex and medulla. Hair epidermis (also known as epidermis and stratum corneum) is the outermost structure of hair, which is composed of flat cells interwoven and stacked into fish scales. The main forming substance is keratin, which is composed of various amino acids. Generally speaking, the damage caused by dyeing hair, perming hair and straightening hair is the damage of hair epidermis. If the hair epidermis is destroyed, the scales of the hair epidermis will arch. In order to get more intuitive and obvious results, we will examine the hair washed with shampoo under the electron microscope. Assuming that the fish scales are not arched or rarely arched, obviously the repair effect is good.