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Phenolphthalein in Hair Relaxer Guide

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Phenolphthalein raises a high level of health concern and is of regulatory concern because:

  • This ingredient is authoritatively recognized to cause cancer, according to the State of California (Proposition 65).
  • This ingredient is suspected of causing reproductive toxicity, according to sources compiled by Scorecard (www.scorecard.org)
  • This ingredient is suspected of causing cancer, according to the U.S. Department of Health and Human Services National Toxicology Program.
Plus 4 more ↓
  • Indicates whether an ingredient in this product is suspected of causing cancer, according to the International Agency for Research on Cancer. Includes any Group 1 (carcinogenic to humans), group 2A (probably carcinogenic to humans), and group 2B (possibly carcinogenic to humans) chemicals that are not yet recognized by the State of California to cause cancer.
  • This ingredient meets the criteria used to identify Substance of Very High Concern in the European Union's REACH program and is being prioritized for replacement by safer alternatives.
  • Indicates that an ingredient in this product has been prohibited in cosmetics use by the European Union.
  • This ingredient has been banned for use in cosmetics in Canada.
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From Wikipedia

Phenolphthalein (pronounced /ˌfiːnɔːlˈθæliːn/ or /ˌfiːnɔːlˈθæli.ɨn/) is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Often used in titrations, it turns colorless in acidic solutions and pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. In strongly basic solutions, phenolphthalein's pink color undergoes a rather slow fading reaction and becomes colorless again. The molecule has four forms:...

Read more at Wikipedia »

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