Letter | Published:

Changes in Vat Dye Systems


WHEN certain vat dyeings on textile substrates are given an after-treatment, such as boiling in water or dilute soap solution, there is a change in the colour of the dyeing1. We have found that when changes of this kind occur with dyed ‘Cellophane’ the absorption spectrum becomes very similar after treatment to that of the corresponding solid-dye film on quartz, prepared in the manner already described2. In our experiments ‘Cellophane’ (deplasticized, British Cellophane, Ltd., PT300, 0.00085 in. thick) was dyed in the normal way from a solution of the vat dye in caustic soda and sodium hydrosulphite. The leuco dyeing was oxidized in air, washed in cold water for 5 min. and dried flat in air. The absorption spectrum of the air-dry dyeing was measured before and after subsequent aqueous treatments.

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    Bean, P., and Rowe, F. M., J. Soc. Dyers Col., 45, 67 (1929). Valko, E. I., J. Amer. Chem. Soc., 63, 1433 (1941). Kornreich, E., J. Soc. Dyers Col., 58, 177 (1942); 62, 318 (1946). Sumner, H. H., Vickerstaff, T., and Waters, E., ibid., 69, 181 (1953).

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    Egerton, G. S., and Roach, A. G., Nature, 179, 491 (1957).

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    Weinstein, J., and Wyman, G. M., J. Amer. Chem. Soc., 78, 2387 (1956).

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    Wyman, G. M., and Brode, W. R., J. Amer. Chem. Soc., 73, 1487 (1951); J. Res. Nat. Bur. Stand., 47, 170 (1951).

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    Egerton, G. S., and Roach, A. G., Nature, 189, 1349 (1957).

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