1, cold perm refers to a form of perm process through the reaction of chemicals at room temperature.

2. The first dose of cold perm solution contains reducing agent, which can open disulfide bonds between hair protein chains, make hair lose its fixed shape and can be reshaped; After the hair is wound on the curling iron, the second dose is applied at an appropriate time. Oxidation can make disulfide bonds between protein chains recombine nearby, thus fixing new shapes.

3. Early perming water generally uses ammonia water to adjust the PH value to help the hair scales open and speed up the reaction. Therefore, perming water has obvious odor, and perming hair often has an unpleasant smell. Now the perm water adopts a more acidic formula.

4. A perm is also a perm. Apply it to the hair piece with ammonia water and put an electric clip (heat) on the roll. Making each hair more fluffy (especially oily hair) will reduce the oiliness after perm, but it is not suitable for dry hair, and it will change color and break hair. Cold perm is the most widely used in our market at present.