Indigo - dyeing

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chemical synthesis
industrial synthesis
For use as a dye, indigo needs to be "dissolved" in water. Currently this is achieved by reduction using sodium dithionite (hydrosulfite) or Spectralite (thiourea dioxide). Here are some of the recipes that have been used in the past.

The urine vat
The woad vat
The copperas vat
The zinc vat
The zinc sulfite vat
The soda vat
The hydrosulfite vat

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