naphthionic acid
noun
naph·thi·on·ic acid
: a crystalline naphthylaminesulfonic acid made by baking a mixture of alpha-naphthylamine and sulfuric acid and used in the preparation of Congo red and other dyes; 4-amino-1-naphthalenesulfonic acid
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“Naphthionic acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/naphthionic%20acid. Accessed 23 Nov. 2024.
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