Phenolsulfonphthalein
What is Phenolsulfonphthalein?
Phenolsulfonphthalein, commonly called Phenol Red, is a synthetic organic compound from the sulfonephthalein family. This water-soluble dye shifts color from yellow in acidic conditions to fuchsia red in alkaline ones, primarily around pH 6.8 to 8.4. In cosmetic formulations, it serves as a colorant, adding vibrant shades to products such as hair dyes, nail treatments, and select skincare items. Manufacturers also employ it during production to monitor pH levels for stability. Its chemical structure includes a sulfonate group, enhancing solubility in aqueous and alcoholic bases. Compared to natural pigments, it provides consistent coloration resistant to fading from light or heat. Present in minute amounts, it integrates seamlessly without altering texture or scent, supporting clear, appealing product visuals while adhering to low-concentration standards in regulated cosmetics.
Benefits
Delivers stable, pH-sensitive color to enhance product appearance.
Non-comedogenic nature helps maintain clear pores.
Low hazard profile allows inclusion in everyday formulations.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Individuals preferring vividly colored cosmetics. | Those with known sensitivity to synthetic sulfonated dyes. |
| Users with acne-prone skin seeking non-pore-clogging ingredients. | Individuals allergic to pH indicator compounds. |
| People interested in pH-balanced product formulations. | Users preferring entirely natural color sources. |
Safety Notes
- Recognized with low hazard ratings from safety databases.
- Approved for cosmetic use under regulatory listings with concentration limits.
Frequently Asked Questions about Phenolsulfonphthalein
What is phenolsulfonphthalein used for in skincare?
It acts as a colorant and pH indicator, providing stable hues in formulations like dyes and treatments.
Is phenolsulfonphthalein safe for sensitive skin?
It carries a low hazard rating and shows no comedogenic effects, suitable for many skin types.
Does it clog pores?
Rated zero for comedogenicity, it does not contribute to pore blockage.