Indigo is a blue dyestuff that was known in ancient Egypt and India; a number of mummies have been discovered that were wrapped in an indigo-dyed cloth.

Indigo was produced from a plant that was mashed and allowed to ferment in tubs of water; fermentation released the colorless indigo substance, which turned a deep blue color when oxidized. The resulting dye was used for coloring cotton and for inks.

The production of indigo halted when chemical processes were developed to replicate it.

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Activity 5: Student Activity Packet
Describe what happens when you stir and heat the indigo bath (indigo, sodium hydroxide, sodium hyrdrosulfite and water). Describe what happens when you put the cotton squares into the indigo bath. Describe what happens when you take the cotton ... ...

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Houston Miss Liberty, by Steven Lavoie Gold Twining Roses and Indigo Leaves: A Rebirth of Gold Rush Quilts, by Chiori Santiago The Wonders of Technology, by Steven Lavoie Wimmer's Nugget, by Steven Lavoie The Crucible Women on the Overland ...

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