A brief description is given of the properties of leather, with particular reference to the application of dyes in presence of non‐ionic, anionic, and cationic auxiliary agents. Fixation of chrome complex, vegetable, and synthetic tanning agents is described. The dyeing of suède leather is considered in detail, and the effect of two “non‐ionic” polyoxvethylene derivatives on the absorption spectra of six sulphonated azo dyes is studied. It is concluded that, to obtain satisfactory dyeings on chrome‐tanned suede leather, the dyes used must have similar affinity, any differences in affinity must be minimised by addition of a suitable auxiliary agent, and the agent must have similar effects on the absorption spectra of all the dyes used.
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