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Hofmann's violet

noun
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Definition of Hofmann's violet

: any of several violet dyes that are alkylated fuchsines made by treating rosaniline with an alkyl halide (as ethyl iodide)

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“Hofmann's violet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Hofmann%27s%20violet. Accessed 4 Jul. 2020.

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