What is hair PH?
Hair pH refers to the acidity or alkalinity of the hair on a scale of 0-14, with 7 being neutral. The natural pH of hair is around 4.5-5.5, which is slightly acidic. This acidity helps to protect the hair from damage and maintain its natural moisture levels. The scalp also has an acidic pH to help keep the hair healthy.
Hair health is closely related to pH levels. The pH scale ranges from 0-14, with a pH of 7 being neutral. Hair naturally has a pH of around 4.5-5.5, which is slightly acidic. This acidic pH helps to protect the hair from damage and maintain its natural moisture levels. When the pH of the hair is altered, it can cause damage and make the hair more prone to breakage.
The hair itself has no pH value. The pH value we mean refers to the pH value of the secretions around the hair.
The pH value is a sign of acidity and alkalinity. It refers to how much acidity and alkalinity there is in the aqueous solution. The number is from 0 to 14 at 25 ° C. 7 is neutral, 7 or more is alkaline, and 7 or less Acidic, the pH of the hair is between 4.5 and 5.5 is the best state of health.
The pH of hair is 4.5 ～ 5.5
The pH value of the shampoo is 5.5 ～ 6.5
Conditioner pH is 2.8 ～ 3.5
The pH value of the perm agent is 8.8 ～ 9.5
The pH of the hair dye is 9.0 ～ 10.0
The pH of seawater is 7.9 ～ 8.5
The pH of the hair straightener is 11.5 ～ 14.0
The hair consists of keratinized epithelial cells. The part outside the skin is called the hair shaft, the part inside the skin is called the hair root, the end of the hair root mostly bugles, and the concave part at the lower end of the hair is called the hair nipple, which contains connective tissue, nerve endings, and capillaries, and provides nutrition. The lower layer of the hair bulb near the nipple is called the hair matrix. It is the growth area of hair and hair follicles, which is equivalent to the spine layer and base layer of the epidermis and has melanocytes. Taking hair as an example, the hair is composed of cells arranged concentrically and can be divided into three layers:
1. The medulla is located in the center of the hair, with 2-3 layers of shrunken cubic keratinocytes. The ends of the hair and vellus hair are medullary.
2. The cortex is the main body of the hair, which is composed of several layers of prismatic keratinized cells, which contain a large number of pigment particles.
3. Hair skin is a thin layer of transparent keratinocytes on the surface of the hair, overlapping each other like a roof tile.
There are also four keys:
1. Hydrogen bond: recombination in case of high temperature and disconnection in case of water.
2. Salt key: When the water breaks, use hot air to recombine and keep it until the next flush, the physical perm is for these two keys.
3. Disulfide bond: It is a particularly hard bond that can be reassembled after being disconnected and controlled during the perm.
4. Amino bond: not in fine hair.
