STAINING, PRACTICAL AND THEORETICAL 



Symbols Dye groups 



A = Anthraquinone (e.g. a/A = acid dye of the 

 anthraquinone group). 

 AC — Acridine {Note: acridine dyes also belong to the 

 xanthene group). 

 AHP = Anthrahydroxyphthalein. 

 AN = Azine. 



AZ = AZO (Note: the small letters m, d or t, after AZ, 

 indicate mono- di- and tri- respectively: e.g. 

 a/AZm = acid dye of the mono-azo group). 

 DPM = Diphenylmethane 

 DPNM = Diphenylnapthylmethane (triarylmethane). 

 F = Fuchsinic acid. 

 HP = Hydroxypyrazol 

 HTPM = Hydroxy triarylmethane (see also P). 

 I = Indigoid 

 ID = Indamine. 

 N = Nitro. 

 NC = Natural colouring matter. 

 NS = Nitroso. 

 O = Oxazine. 

 P = Phthalein. 

 PDNM = Phenyldinapthylmethane (triarylmethane). 



SP = Sulphonphthalein (these may also be classed as 



HTPM). 

 ST = Stilbene. 

 SU = Succein 

 TL = Thiazole. 

 TN = Thiazine. 

 TPM = Triphenylmethane (triarylmethane). 

 X = Xanthene. 



Note: Michrome numbers given against the names of the dyes 

 in the following Tables are taken from Encyclopaedia of Microscopic 

 Stains (E. Gurr, i960). Dyes marked with an asterisk (*) have 

 molecules consisting of two univalent dye-ions in association 

 with one divalent cation, or in the case of Nile Blue, with one 

 univalent anion. Napththol green, however, has three univalent 

 dye- ions. 



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