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These type of Dyestuffs are mainly applied by under given two methods:
A. Metachrome Method :
It is possible to dye many types of Chrome dyes in a single bath i.e. combining mordanting & dyeing. The most essential requirement is to ensure proper dye bath exhaustion at ph 6 - 8.5 and also the dye has to be compatible with metachrome mordant.
Metachrome Mordant is made as under:
1part of sodium chromate
2 parts of ammonium sulphate
The dye bath is set with :
3-8% Metachrome Mordant (depending upon depth of the shade)
Note : Mostly light and medium shades are dyed with this process.
B. After Chrome Method
This is a two step process, the dye bath is set with:
Step 1. 5-10% G. Salt
X% Acetic Acid (ph 4-5)
Y% Levelling Agent
The dyeing is continued in this bath till complete exhaustion
Step 2. After complete exhaustion in step 1 the dye bath is cooled to 70 degree centigrade. Then 0.25 to 2.5% potassium dichromate (usually half the quantity of dye stuff) well dissolved in water is added to the dye bath and the dye bath is raised to boil once again (gradually @ 1 degree centigrade per minute). The dye bath is maintained at boil for 30-60 minutes inorder to completely reduce the chromate on the fibre.
| Sr. No. |
Name of Product |
C.I.No. |
Cas No. |
Shade |
| MORDANT CHROME DYES |
| 1 |
FAST RED BS |
RED 7 |
5858-61-7 |
 |
| 2 |
FAST BLUE BX |
BLUE 13 |
- |
 |
| 3 |
FAST BLUE GR |
BLUE 18 |
6448-97-1 |
 |
| 4 |
BROWN EBN |
BROWN 1 |
- |
 |
| 5 |
BROWN 2RH |
BROWN 33 |
12269-85-1 |
 |
| 6 |
BLACK A |
BLACK 1 |
1064-48-8 |
 |
| 7 |
BLACK T 200% |
BROWN 11 |
- |
 |
| 8 |
BLUE BLACK RSS |
BLACK 17 |
- |
 |
ACID DYES | ACID MILLING DYES | ACID TPM/AQ DYES | ACID 1:1 METAL COMPLEX DYES
ACID 1:2 METAL COMPLEX DYES | ACID BROWN FOR LEATHERS | MORDANT CHROME DYES Reactive Dyes | Vat Dyes | Direct Dyes | Solvent Dyes | Leather Dyes| Dye Intermediates |
