“fast scarlet”

We have one entry that includes the term fast scarlet.

fast scarlet R base

noun, often capitalized F&S

: 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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