Congo red

noun

An azo dye that turns red in alkaline, blue in acidic solutions.

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Meanings

nounCongo red (countable and uncountable, plural Congo reds)

plural Congo reds

  1. countableuncountableAn azo dye that turns red in alkaline, blue in acidic solutions.
Cite this entry
APA

Congo red. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/Congo%20red

MLA

“Congo red.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Congo%20red. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “Congo red,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/Congo%20red.

Source: Congo red on Wiktionary, CC BY-SA 4.0.