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fast scarlet R base

noun, often capitalized F&S
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Definition of fast scarlet R base

: an orange-red crystalline amine CH3OC6H3(NO2)NH2 that is often sold in the form of its stabilized diazonium complex salt with zinc chloride and is used in producing azoic dyes; 4-nitro-ortho-anisidine

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“Fast scarlet R base.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fast%20scarlet%20R%20base. Accessed 28 Feb. 2021.

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