noun. The name is applied to two basic dye-stuffs of the diphenyl-methane type. The older was discovered in 1883; the suffixes O, I, and II indicate various degrees of its purity and strength. The other, known as auramine G, was discovered in 1892, and differs from the former in that it contains a tolyl in place of a phenyl group.

noun. A coal-tar color used in dyeing.

noun. Any of a family of fluorescent dyes used to stain tissues for fluorescence microscopy

"By adding the dye in portions this difficulty is overcome and more level shades are obtained; it is met with in all cases of jigger dyeing, but it is most common in dyeing cotton or wool with basic dyes like magenta, auramine, methyl violet or brilliant green, and in dyeing wool with acid dyes like acid green, formyl violets, azo scarlet, or acid yellow."

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