Improved Treatment of Indigo for Dyeing. (Editor's Scientific Record.)

Harper's new monthly magazine 257, OCT 1871

Mr. J. de Werveine, of Ghent, employs a composition for dyeing with indigo which, he says, essentially expedites the operation, can be used cold, and yields a greater amount of dye from the same quantity of indigo. This is prepared as follows: To each pound of indigo are to be added one pound of amorphous zinc powder, one pound of madder, 750 grains of protochloride of tin, and one pound of slacked lime; the resulting mass then to be completely dissolved in 112 gallons of cold water.

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