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chemical hair relaxing Rearranges the structure of curly hair into a straighter or smoother form. thio relaxers Use the same ammonium thioglycolate (ATG) that is used in permanent waving, but at a higher concentration and a higher pH (above10). thio neutralization Stops the action of a permanent wave solution and rebuilds the hair in its new curly form. hydroxide relaxers Very strong alkalis with a pH over 13. The hydroxide ion is the active ingredient in all hydroxide relaxers. lanthionization Process by which hydroxide relaxers permanently straighten hair; breaks the hair's disulfide bonds during processing and converts them to lanthionine bonds when the relaxer is rinsed from the hair. hydroxide neutralization The neutralization of hydroxide relaxers is an acid-alkali neutralization reaction that neutralized (deactivates) the alkaline residues left in the hair by the hydroxide relaxer and lowers the pH of the hair and scalp. Hydroxide relaxer neutralization does not involve oxidation or rebuild disulfide bonds. metal hydroxide relaxers Ionic compounds formed by a metal (sodium, potassium or lithium) combined with oxygen and hydrogen. base cream Oily cream used to protect the skin and scalp during hair relaxing protective base cream Oily cream used to protect the skin and scalp during hair relaxing base relaxers Relaxers that require the application of protective base cream to the entire scalp prior to the application of the relaxer. no-base relaxers Relaxers that do not require application of a protective base cream normalizing lotions Conditioners that restore the hair's natural pH after a hydroxide relaxer and prior to shampooing soft curl permanent Combination of a thio relaxer and a thio permanent wrapped on large rods to make existing curl larger andlooser