A process for the dyeing of wool treated with an anti-felting agent

摘要

A process for the dyeing of wool which has been treated with an anti-felting agent using a metal complex of an azo dye which contains at least one sulphonic acid and/or at least one sulphonate group and in the presence of in the range of from 10 to 15% by weight (based on the weight of dry goods) of a non-colouring, inert, neutral alkali metal salt. This enables dyeing to be carried out at, e.g. 70-85 DEG C, when previously the dyeing of such wool had to be carried out at the boiling temperature of the dyebath to ensure a level and fast colouration. Dyeing at this temperature not only strained and hardened the wool fibres but was also costly in terms of heating energy.