How to do Cold Perms at Home?
Cold perms was first introduced in California during 1936-1938. The process, nationwide, becalm popular in 1940. A crude system of permanent waving was practiced by the earl} Egyptians and Romans in 1905. It introduced a method of applying heat to preformed( curls through a series of heaters attached by wires to the machine. Cold waving has many advantages as below:
It is relatively inexpensive as no high priced equipment is required.
It is the accepted method of permanently waving nearly all types of hair. However, there are some exceptions as some women may be allergic to the waving lotion.
The modern permanent waving is performed solely by the cold waving method. This is the accepted method of permanently waving all types of hair by the action of a chemical called thioglycolate, applied without heat.
In the process of cold perms, the hair is moistened with a solution of ammonium thioglycolate and then wound onto curlers, and left on until the hair has taken the form required. Now the process is reversed to form new links. This is done by moistening the hair with a neutraliser, which neutralises the action of the thioglycolate. The neutralisers usually consist of liquids such as hydrogen peroxide or solids such as perborates or persulphates, mixed with acids. The two solutions applied alternatively work in opposite ways, so that to counter-balance their action it is essential that their strength and the processing time for both be identical.
Precautions in Cold Perm
Observe the following precautions while having perms:
1. Avoid use of neutral cold perms, which hairdressers usually apply these days. They are - the heated cold perm and the cooled hot perm. These are called Tepid perms.
2. It is advisable not to have a perm at the time of menstruation. Cold perms require very strong alkaline solutions of thioglycolate. It has been proved that after a hot perm, the hair resistance is reduced by 60% and a cold perm reduces it by only 15%.
3. Hot perms make the hair very fragile and if done too frequently, could even result in the hair breaking at the scalp. Perms used today may result in deterioration of the hair, often have an irritating action on the scalp and the risk of skin intolerance (dermatitis).
4. Perms make the hair very fragile and dry, especially in case of hair that has been previously bleached or damaged by shampoo or excessive brushing. Do not perm the hair, if it is not in good condition or if it has been recently bleached.
5. Do not wind hair too tightly on the curlers nor expose it for to the thioglycolate solution, insufficient rinsing of hair after application of solution and too strong a solution.
6. The thioglycolate left on the hair for too long may destroy the keratin and cause the hair to break off.
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