Description
Patent Blue
Patent Blue V is a safer longer-lasting alternative to sulphovanillin. Also useful for some chrysocystidia i.e. Hypholoma, Stropharia & Pholiota. Please note: after staining for a few minutes, wash 2 x with water and mount in water (not KOH or NaOH as this makes the stain fade).
More information on stains from the British Mycological Society
Patent Blue V, also called Food Blue 5, Sulphan Blue, Acid Blue 3, L-Blau 3, C-Blau 20, Patentblau V, Sky Blue, or C.I. 42051 and is a dark bluish synthetic triphenylmethane dye used as a food coloring. As a food additive, it has E number E131. It is a sodium or calcium salt of [4-(α-(4-diethylaminophenyl)-5-hydroxy- 2,4-disulfophenylmethylidene)-2,5-cyclohexadien-1-ylidene] diethylammonium hydroxide inner salt.