Abstract
Durazol Red 2B shows maximum affinity for cotton at 40°c., but is absorbed more rapidly at higher temperatures; on wool both the rate of absorption and the amount of dye absorbed increase as the temperature is raised. The effects of adding Glauber's salt to the dyebath, and of varying the liquor–goods ratio, are very similar for both wool and cotton. Addition of small amounts of acid to the dyebath greatly increases the amount of dye absorbed by the wool, but the absorption by cotton is relatively insensitive to pH changes. Provided that acid is not present, the percentage exhaustion of a union dyebath is low, except when the amount of dye available is small. When only a small amount of dye is used, the eolour of the two fibres is the same when each contains the same amount of dye. As the percentage of dye on the fibre increases more dye is required on the cotton than on the wool if the shades on the two fibres are to match. Ultimately, the amount of dye required on the cotton may be four times as much as that required on the wool. The maximum depth of shade obtainable on cotton is much less than that obtainable on wool.
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