Hair biology knowledge, hairdressing professional knowledge, who will explain?

Drink plenty of water, vegetables, and vitamins.

How to avoid hair quality when perming hair?

What is Hair Chemistry.

1. Epidermal layer: The fish scale-like fine transparent body is arranged, with about 27-28 layers.

2. Cortical layer: composed of spiral-shaped fibrous bodies. Contains melanin granules, 10% water, protein, amino acids.

3. Medullary layer: formed by the arrangement of vacuum-like cavernous bodies (not present in fine and soft hair).

2010 Ceramic perm technology theory explanation.

Shen Hairdressing Original Perm Concept Hair Physiology Knowledge.

There are more than 2,000 kinds of protein (DNA) in the human body, with 65% of the body being protein, 18% of water and 17% of fat.

1. Hair formation: It is formed by the hardening and stacking of proteins.

2. The formation of hair follicles: determines the shape of hair, which can be changed by perms, and the hair itself is lifeless and cannot survive without the scalp.

3. The role of hair: In ancient times, it was used to shelter from the wind and rain, and in contemporary hairstyle design, 1, beautiful 2, warm 3, and protect the scalp.

5. The growth of hair is divided into three stages: 1. Germinal stage; 2. Growth period; 3. Telogen period.

Sixth, the three layers and four keys of hair:

A: Three layers:

1. Epidermal layer: the fish scale-like fine transparent body is arranged, about 27-28 layers.

2. Stratum corneum: It is arranged by spiral-shaped fibers, containing melanin particles, proteins, amino acids and other substances.

3. Medullary layer: It is formed by the arrangement of vacuum-like sponges, and fine and soft hair is not present.

b: four major bonds: 1. hydrogen bonds; 2. a salt bond; 3. Disulfide bonds; 4. Amino bonds;

1. Hydrogen bonding and salt bonding: it will be disconnected when encountering water, recombined when encountering hot air, and affected by water and temperature.

ringing, can be cut off after reorganization. Hydrogen and bonds have a heat accumulation effect, and ceramic ironing can open hydrogen bonds and recover after drying.

Memories are restored, and hairstyles are maintained (ceramic perms produce high-temperature memories at 135 when heated. ）

2. Disulfide bond: the strongest chain bond, a key chain controlled during perming, which can be cut off and reorganized.

3. Amino bonds: fine and soft hair does not exist, providing nutrients to the hair.

Physical properties of hair: 1. Elasticity; It has strong elasticity 2 and elasticity; Stretch when exposed to water, shrink after drying 3, plasticity; Hair can be deformed with hairdressing tools.

Chemistry of the hair:

1. Water absorption: The water absorption of damaged hair is very strong.

2. Drainage: the resistance to hair is more obvious;

After understanding the formation of hair, we need to analyze the hair type and adopt the corresponding techniques to protect the hair:

1: Perm and dye hair: 1. Resist; 2. Normal; 3. Damaged; 4. Extremely damaged.

2: Washing, protecting time: 1. Dry; 2. Neutral; 3. Oily; 4. Damaged;

The color of normal hair is between 2-4 degrees, the damage is about 5-7 degrees, the ends of the hair are dry, there are split ends, and the extremely damaged hair is soft at 7-9 degrees: the hair cuticles fall off and there is no plasticity.

The pH value of the hair and others: pH value: The concentration of hydrogen ions, which refers to the acidic and alkaline values of certain solutions.

The pH value of the hair is between 4-4, between 3-4 for hydrogen peroxide, and between 7-9 for perm; Straightening paste 3—5;shampoo 5-6; Conditioner: 3-5;Dye paste: 8-9

Take a closer look for yourself! Great improvement helps! Take your time!

The epidermis layer makes up 10% of the hair, reflecting the transparency and gloss of the color; Cortical layer --- 80% of the hair; The medullary layer, which --- 10% of the hair, is also known as the central layer, which plays a role in supporting and keeping warm, but fine and soft hair does not;

Four key 1Hydrogen bonding (recombination at high temperatures, disconnection at water).

2.Salt bonds (broken in contact with water, recombined with hot air, and maintained until the next flush, these two keys are targeted by physical perm).

3.Disulfide bonds --- the hardest bonds, they can be cut and recombined, and they are targeted by chemical perms.

4.Amino bonds are not present --- fine hair, only coarse hair.

Three layers 1, epidermal layer: fish scale-like fine transparent body arrangement, about 27-28 layers.

2. Cortical layer: composed of spiral-shaped fibrous bodies. Contains melanin granules, 10% water, protein, amino acids.

3. Medullary layer: formed by the arrangement of vacuum-like cavernous bodies (not present in fine and soft hair).

Congenital alopecia, pathological alopecia, oily alopecia, hair loss caused by poor lifestyle