The video shows two separate drums of indigo water being oxidised using a motor. The drum at the front shows the initial lighter blue color of indigo. The second drum shows the a much darker shade, indicating the oxidation is almost complete!
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Details
Title: Oxidising the Indican in the Water
Indigo Oxidation Video
Date Created: 2016-09-21
Location: Mana village, Bageshwar District, Uttarakhand, India