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Updated: July 13, 2026
Although this process is well known, a short description of it may not here be out of place. The process depends on the reduction of indigo to indigo-white, or soluble indigo, by means of hyposulphite, or, as it is generally termed to avoid confusion with antichlore, rightly named thiosulphate of soda, hydrosulphite of soda.
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