Among common hair relaxing agents, which is considered the most caustic?

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Multiple Choice

Among common hair relaxing agents, which is considered the most caustic?

Explanation:
Causticity in hair relaxing agents relates to how alkaline they are—the higher the pH, the more aggressive the chemical is likely to be on skin and hair. Among common relaxers, sodium hydroxide is the strongest alkali used in lye-based formulas, and it operates at a very high pH. That makes it the most caustic of the listed options. Ammonium thioglycolate-based relaxers are no-lye and milder in comparison, guanidine hydroxide is also milder, and calcium hydroxide, while alkaline, is not as caustic as sodium hydroxide.

Causticity in hair relaxing agents relates to how alkaline they are—the higher the pH, the more aggressive the chemical is likely to be on skin and hair. Among common relaxers, sodium hydroxide is the strongest alkali used in lye-based formulas, and it operates at a very high pH. That makes it the most caustic of the listed options. Ammonium thioglycolate-based relaxers are no-lye and milder in comparison, guanidine hydroxide is also milder, and calcium hydroxide, while alkaline, is not as caustic as sodium hydroxide.

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