Congo Red is a pH indicator that colors aqueous solutions blue below pH 3.0 and becomes red above pH 5.0. Reagents utilizes the highest quality raw materials to meet of exceed the specifications of the American Chemical Society.

Chemicals sold by Cole-Parmer® are not intended for and should not be (i) used for medical, surgical or other patient oriented applications, or (ii) combined with any food product or ingested in any form.