Definition of M acid
: a crystalline sulfonic acid NH2C10H5(OH)SO3H made by alkaline fusion of a disulfonic acid of alpha-naphthylamine and used as a dye intermediate; 5-amino-1-naphthol-3-sulfonic acid
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“M acid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/M%20acid. Accessed 16 May. 2022.
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