The levelling dyes of this group require strongly acid dyebaths employing Sulphuric or Formic acids. The pH of the dyebath is around 2.5-3. The dyes are generally bright with good levelling properties but have moderate wet fastness. The fastness to light varies from moderate to excellent. The Milling & TPM dyestuffs are dyed in a weakly acid or neutral bath employing a pH around 4-4.5. Acetic acid or Acid liberating salt such as Ammonium sulphate or Acetate are used. The shades obtained are bright with good all round colour fastness properties.
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