Definition: a 25% solution of trichloroacetic acid, containing 0.9% ferric chloride; a drop of the reagent added at the surface line of barium chloride-impregnated filter paper that has been dipped in urine for 10 seconds will give a green color if bilirubin is present.
See Also: Fouchet stain
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Examples: glitazone, GI cocktail, etc.