Does not need reduction nor oxidation.

The industry:
Indigo dyeing is usually done in yarn that is then woven to produce Denim with a characteristic worn faded look.
The problems of dyeing indigo are mainly related to the pollution of the process, due to the reduction agents and caustic soda discarded into the effluent and working conditions due to indigo powder in the air, released during the oxidation process.
Dyeing with H2COLOR-Denim is a simple short process that does not need reduction nor oxidation. The indigo pigment is in the form of a liquid dispersion of Indigo pigment complexed with H2COLOR-AUX. The dispersion is stable and homogeneous, something that cannot be achieved using indigo alone. It is then ready to be applied by an exhaustion process, using a proprietary fixing agent. It is a simpler process and level colors are obtained on fabric or garment dyeing.
Dyeing is performed at 60ºC for 1 hour at neutral or weakly basic conditions, followed by 2 rinses of 10 minutes each, at a liquor ratio of 1:10, at room temperature, and then proceed to washing to wash-down the excess indigo.
Process for a mild washing effect is in washing machine with the abrasion caused by the tumbler of the machine itself.
Enzymes or other methods for washing-down colour may be used if necessary, for stronger action. Dry in the tumble drier.

When laundering for the washed down effect on garments, indigo is very polluting. Bleaching is usually done with hypochorite to bring down the color from dark dyed indigo jeans. With the H2COLOR process, the process is a lot less polluting not needing bleaching but only friction, since light colors are obtained directly when dyeing garments.