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Updated: May 11, 2025
Another method to clear them: Make up three lukewarm waters, in first put some bleaching liquor, in second a little vitriol, handle these two, and rinse through the third, hydro-extract, and hang in stove. This is the method employed generally in small dye-works for all dresses for black; their lots are so small. This also happens when the water used contains iron in quantity or impure copperas.
The aquafortis vessel to be outside the dye-house, or, if inside, to be provided with a funnel to carry away the nitrous fumes, as it is dangerous to other colors. Preparation or mordant for eight dresses, silk and wool mixed, for black. 4 lb. Copperas. ½ " Bluestone. ½ " Tartar. If very heavy, run through lukewarm water slightly acidulated with vitriol, rinse, hydro-extract, and hang in stove.
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