Congo Red

nounverified·updated May 18, 2026

a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)

Framework senses

1 sense across 1 framework

Wordset Dictionary1 senseview framework →

§1: a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)