Crowle's stain

Crowle's Stain, also a protein stain like for example Acid Violet 17 and Amido Black, colors marks in blood red. It is also known as Crowle's double stain because it contains two dyes: Crocein Scarlet 7B (major component) and Coomassie Brilliant Blue R (minor component).
The formulation contains a toxic substance (trichloroacetic acid) and acetic acid but is otherwise water-based.
The stained marks can hardly be lifted with a white gelatin lifter and do not fluoresce, either on the treated surface or the gellifter. In comparisons Crowle's stain gives less contrast than Amido Black or Acid Violet 17.

Product #
Crowle's Stain, 500 ml in a spray bottle

Name: Crocein scarlet 7B, CI Acid Red 71, 1-Naphthalenesulfonic acid,7-hydroxy-8-[2-[2-methyl-4-[2-(2-methyl-4-sulfophenyl)diazenyl]phenyl]diazenyl]-, sodium salt (1:2)
CAS No.: 6226-76-2

Name: Coomassie Brilliant Blue R, CI Acid Blue 83, Benzenemethanaminium, N-(4-((4-((4-ethoxyphenyl)amino)phenyl)(4-(ethyl((3-sulfophenyl)methyl)amino)phenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethyl-3-sulfo-, inner salt, sodium salt (1:1)
CAS No.: 6104-59-2