especially after April when the water level reduced in the well," said Haris. Post April or May, they separate the tanks and fill them alternatively for the iron to oxidise and solidify as iron oxide.

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black oxide of iron, 90 parts ; red lead, 100 parts; Sand, 30 parts. 3. Decompose the bichromate by immersion in a bath formed of: Water, 100 parts by weight; hydrochloric acid, 5 parts.

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