The Fibre Garden : Dyes
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Indigo – Pre-reduced
Pre-reduced (or "instant") Indigo comes as freeze-dried crystals, made in India. This saves the dyer the hassle of working with caustic lye to dissolve natural ground indigo into a stock solution.
All that's required to be done is to dissolve the Indigo crystals in a bucket of warm water with Thiourea dioxide (a reducing agent that removes air from the vat), add Soda Ash (dissolved in boiling water) to raise the pH, stir together and wait an hour or two. Do this outside on a nice warm day, or indoors with good ventilation.