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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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