Basic theory of hair;
First, hair knowledge
1, hair number 10- 15000.
2. The growth rate is about 1.2— 1.8cm per month.
3. The average life span is about 2-6 years.
4, natural hair loss 50- 100 a day.
5. The water content is11-16, and it has elasticity, toughness and softness.
6, hair structure epidermis, cortex, medulla, characteristics: thickness, luster, hair color
7. pH value pH 4.5-5.5 Weak acidity
Second, the structure of hair:
1. According to the difference of human health, secretion and maintenance,
Hair can be divided into healthy hair, dry hair, oily hair and damaged hair.
2. Choose the right shampoo
Most shampoos contain chemicals, so you must be careful when choosing.
Shampoo can be divided into emulsion, paste, powder and block according to different forms.
According to the raw materials, there are synthetic and soap-based types.
3, product classification:
Cleaning category: shampoo
Nutrition care category: conditioner. Bake oil, pour film, etc.
Perm: hair water, cold perm liquid, ion perm, etc.
Bleaching and dyeing: bleaching powder, bleaching paste and dyeing paste.
Hair accessories: gel water. Hair mud, hair wax, dry glue, etc.