a) With the molecularly – dispersed acid dyes, on account of their good migrating properties, continued boiling in the same liquor is often effective. It must, how ever be borne in mind that wool felts if it so boiled form too long.

b) Boiling inside fresh liquor with 20% of Glauber‟s salt usually strip a few of the color, plus this is tired again by careful addition of acid or, ideally, ammonium salt.

c) If treatment with Glauber‟s salt is not lucrative, more of the color is stripped by boiling with 0.5% ammonia, or inside liquor containing 2% pyridine.

d) Another system is with boil the unevenly-dyed information with 3 with 5% of the cationic, non-ionic mixture including Tine gal W or Lyogen SMK. Whenever enough color has been removed by any of these compounds the wool is rinsed plus redeye.
Application of Acid Dyes on Silk
Although silk has an affinity for acid dyes the hues are less quick than about wool. Silk might exert its affinity for acid dyes at lower temperature than is the case with wool, plus dyeing is commonly commenced at 40ºC as well as the temperature is not permitted with rise above 85ºC. Glauber‟s salt is not appropriate for employ with silk because it diminishes its luster. Sulfuric acid damages the silk. Acid utilized ought to be acetic acid. While utilizing boiled off liquor the shower should be neutral or just faintly acidic.

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