fast red
noun,
often capitalized F&R
Definition of fast red
: any of several fast red azo dyes: such as a : a monoazo acid dye that dyes wool and silk red —called also Fast Red A b : a monoazo acid dye that dyes wool and silk claret and is used chiefly as a biological stain —called also Bordeaux B, Bordeaux red, Fast Red B
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