Denim Discharge or Jeam Discharge

SUBJ-10:

Indigo Discharge, Vat Discharge, Denim Discharge or Jeam Discharge all in one.

Chemicals:

Potassium permanganate (Oxidizing agent), Sodium bisulfite (Reducing agent), Acetic Acid (Conc), Special Thickener, Soap (Polyglycolether, Nonionic).

Process:

Purpose is to discharge Blue or Black color Denim through Oxidation reaction of Potassium permanganate in acidic pH and than Reduction through Sodium Bisulfite again in acid pH. Finally soaping.

Recipe:

Stock paste:

Special Thickerner                35g/Kg

Potassium permanganate         40g/Kg

Acetic Acid                             10g/Kg

Water                                      Balance

Total                                       1 Kg

Processing Steps Involved:

¯  Print and Dry at 100-120C.

¯  Washing off in a reduction for fifteen minutes at 70C, bath containing

1.      Sodium Bisulfite         10g/L

2.      Acetic Acid                 0.5g/L

Wash for 10Min at 70C with Soap (Polyglycolether, Nonionic).

¯  Rinse Warm and Cold.

Remarks:

This will clearly give you good discharge result. I will try to upload photo effects of these discharges. I also tried some other temperatures for drying which was 150 and 180C but, results were not  too good (mean no big change). One can try other oxidizing agent and reducing agent like sodium pryrosulfite (Sodium meta bisulfite), Sodium Hydro sulfite.

Please Note  Thickeners (Including both natural, Synthetic) are not compatible with potassium per manganate and acetic acid. They form jelly and heat is evolved during stirring. So, special thickeners are need for this kind of process. That’s why I used word “Special Thickener”. Still need to look for the chemistry of this special Thickener. If  you are familiar with the chemistry of Special thickener. Comments are welcomed.

During printing double stroke can give you more better result, If one had facility to do so.

Another Application of this effect in foam discharging