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Cards In This Set
| Front | Back |
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When you rearrange the basic structure of very curly hair into a straight form, you are performing:
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chemical hair relaxing
Whereas permanent waving curls straight hair, chemical hair relaxing straightens curly hair. |
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Except for their objectives, a chemical relaxing service is very similar to:
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permanent waving
The chemistry of thio relaxers and permanent waving is exactly the same. |
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All permanents and all relaxers--both thio and hydroxide--rearrange the basic structure of the hair by:
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breaking disulfide bonds
Permanents break the disulfide bonds of straight hair; relaxers break the disulfide bonds of curly hair. |
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The ingredients found in most relaxers are the same as those in:
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depilatories
Like depilatories, relaxers are very alkaline and can melt or dissolve hair if used incorrectly. |
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A characteristic of extremely curly hair is that it:
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has varying diameters
The hair is irregular; cross-sections vary in shape and thickness along their lengths. |
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The weakest, thinnest sections of extremely curly hair are the:
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twists
Extremely curly hair usually breaks at the twists because of the inherent weakness in that section. |
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The type of chemical relaxers known as thio relaxers:
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have a pH above 10
Thio relaxers also have a higher concentration of ATG than is used in permanent waving. |
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On the pH scale, a ________ difference in concentration is represented by every step.
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tenfold
A pH of 6.0 is ten times more alkaline than a pH of 5.0. |
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Methods of altering the natural wave pattern of the hair by a chemical change are called:
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chemical texture services
Texture services can be used to curl straight hair, straighten overly curly hair, or soften coarse, straight hair. |
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When the hair has a strong, compact cuticle, it is generally:
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resistant hair
Hair with a strong, compact cuticle resists penetration and is difficult to service. |
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In order to perm porous, damaged, or chemically treated hair, you should use a solution that is:
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less alkaline
This type of hair has a raised cuticle and does not need a highly alkaline solution to penetrate to the cortex. |
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The hair's natural wave pattern can be changed by breaking the:
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side bonds
Breaking the three kinds of side bonds, or cross bonds, is what makes permanent waving, wet setting, thermal styling, soft curl permanents, and chemical hair relaxing possible. |
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Disulfide bonds are chemical side bonds that, of the three types of side bonds, are the:
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strongest
Disulfide are strong chemical side bonds that are not broken by heat or water. |
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The condition that can break salt bonds easily is:
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changes in pH
Salt bonds re-form when the pH returns to normal. |
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One type of physical change in the hair is a:
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wet set
The hydrogen bonds in the hair break and re-form in a new shape, but this change is only temporary. |
