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TANACID ACID DYES
are the selected range of dyestutfs suitable for dyeing on pure
wool. The various dyes in the shade card have been grouped
mainly according to their exhaustion behaviour, colour fastness
and other characteristics on wool. The following are the main
groups:
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a) |
TANACID LEVELLING & TPM DYES
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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b) |
TANACID 1:1 METAL COMPLEX DYES
This
group comprises premetallised 1:1 Metal Complex Acid Dyes.
These dyes have excellent level dyeing properties and all
round good colour fastness. In view of their outstanding
levelling properties, the dyes are eminently suitable for
the production of even very pale shades with good colour
fastness. |
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c) |
TANACID 1:2 METAL COMPLEX DYES
These dyestutfs are
dyed in a neutral or slightly acidic bath employing a pH
around 5-7. The dyestuffs have a good degree of penetration,
therefore, particularly suitable for the dyeing tightly
woven goods. Also shades obtained have good all round
fastness properties. |
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