The colloid chemistry of dyes: the aqueous solutions of benzopurpurine 4B and its isomer prepared from m-tolidine.—Part I

Abstract
Substantive cotton dyes may be prepared from such para diamines as benzidine, diamidoazobenzene, diamidostilbene, etc., and also from homologues of these compounds containing the substituting group in the ortho position to the amido group. It is a well-known fact, however, that if the substituting group is in the meta position to the amido group the compound does not yield azo dyes which are substantive to cotton. Thus, although substantive dyes may be prepared from o-tolidine, H2N-NH2 CH3-CH3 they cannot be prepared from m-tolidine.

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