You can email us at, or call us on 01202 539791.Email: Phone: 01202 539791.


Phenol Red

Phenol red (also known as phenolsulfonephthalein or PSP) is a pH indicator.Its color exhibits a gradual transition from yellow to red over the pH range 6.8 to 8.2. Above pH 8.2, phenol red turns a bright pink (fuchsia) color. Phenol red is used widely in culture media to identify changes from neutral to acidic pH values. It is typically used in cell culture media at 11 mg/L.
In microbiology it is used as a component of Phenol Red Dextrose Broth, used for the detection of fermentation by a variety of microorganisms.
In cosmetics it is reported to be used as a component of hair relaxer formulations.

Product Details

Category Cosmetic Raw Materials
Dyes, Stains & Indicators
Microbiology Products
Price POA
CAS Number 143-74-8
Formula C19H14O5S
Molecular Weight 354.38
Purity Lambda max 557nm
Appearance Bright red to dark red powder
Availability In Stock
Storage Conditions Room temperature
MDL Number Request if not shown
Harmonised Tariff 2934.999090

Product Enquiry

Send us your enquiry for Phenol Red. We offer custom pack sizes at special prices. We aim to respond to your enquiry within 24 hours.

We value your input so if you have suggestions regarding new applications for Phenol Red email us and we will include your contribution on the website.

Enquire about product

Back to Top