CH 20 PretestVersion en ligne Evaluate yourself & discover what you already know about chemical texture services. par Rosalind Carter 1 The natural pH of hair is between 4.5 and 5.5. a True b False 2 Disulfide bonds cannot typically be broken by water. a True b False 3 You should always perform an elasticity test before perming a client's hair. a True b False 4 Alkaline permanent waving solutions tighten the cuticle, causing the hair to contract and curl. a True b False 5 When perming porous hair, you should use a highly alkaline permanent waving solution. a True b False 6 In permanent waving, most of the processing takes place toward the end of the processing time, after about 15 to 20 minutes. a True b False 7 When perming a client's hair, you should rinse the hair with a strong blast of hot water. a True b False 8 When wrapping hair for a perm, you should always wrap against the natural growth pattern. a True b False 9 Normalizing lotions have an acidic pH. a True b False 10 When performing a hair relaxing service, you should never apply a hydroxide relaxer on hair that has been previously treated with a thio relaxer. a True b False Feedback 1 Hair has a natural pH between 4.5 and 5.5, and chemical solutions used in texture services raise the pH of the hair to an alkaline state, which opens the cuticle layer and allows the solution to reach the cortex layer, where restructuring occurs. 2 Disulfide bonds are broken by heat, not water. 3 You should always perform an elasticity test before perming the hair because chemical changes are involved. 4 Alkaline permanent waving solutions soften and swell the hair, and they open the cuticle, permitting the solution to penetrate into the cortex. 5 Porous hair is easily penetrated and could be damaged by a highly alkaline permanent waving solution. 6 Most of the processing takes place as soon as the solution penetrates the hair, within the first 5 to 10 minutes. 7 You should always rinse the hair with a gentle stream of warm water, and never a strong blast of hot water. 8 Wrapping with the natural direction of hair growth causes the least amount of stress to the hair, while wrapping against the natural growth pattern can produce a band mark or breakage at the base of the curl. 9 Normalizing lotions have an acidic pH and are used to restore the hair's pH (4.5 to 5.5) before the final neutralizing shampoo. 10 You should never apply a hydroxide relaxer on hair that has been previously treated with a thio relaxer, and you should never apply a thio relaxer on hair that has been previously treated with a hydroxide relaxer.
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