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The Choice of Re-Agents for acid

Restoring Color. The choice of re-agents 370. To Remove Stains of Wine, is not a matter of indifference; vegetable acid Fruit, &c., after they have been long in (Decolorized Vinegar, see Index), is gener- the Linen. Rub the part on each side with ally preferable to mineral acids. The sul-yellow soap; then lay on a mixture of starch phurous acid (see No. 360), however, may be in cold water very thick; rub it well in, and used for spots from fruit; it does not injure expose the linen to the sun and air till the blue upon silk, or the colors produced by as- stain comes out. If not removed in 3 or 4 tringents; nor does it affect yellow upon cot- days, rub that off and renew the process. ton. A volatile alkali (Water of Ammonia) When dry it may be sprinkled with a little succeeds better than a fixed alkali in remov- water. ing spots produced by acids. They are usual-