TWO COLORLESS FLUIDS MAKE A COLORED ONE.
Put into a wine-glass of water a few drops of prussiate of potash, and into a second glass of water a little weak solution of sulphate of iron in water; pour the colorless mixtures together into a tumbler, and they will be immediately changed to a bright deep blue.
Or, mix the solution of prussiate of potash with that of nitrate of bismuth, and a yellow will be the product.
Or, mix the solution of prussiate of potash with that of sulphate of copper, and the mixture will be of a reddish-brown color.
CHANGE OF COLOR BY COLORLESS FLUIDS.
Three different colors may be produced from the same infusion, merely by the addition of three colorless fluids. Slice a little red cabbage, pour boiling water upon it, and when cold decant the clear infusion, which divide into three wine-glasses: to one, add a small quantity of solution of alum in water; to the second, a little solution of potash in water; and to the third, a few drops of muriatic acid. The liquor in the first glass will assume a purple color, the second a bright green, and the third a rich crimson.
TO CHANGE A BLUE LIQUID TO WHITE.
Dissolve a small lump of indigo in sulphuric acid by the aid of moderate heat, and you will obtain an intense blue color; add a drop of this to half a pint of water, so as to dilute the blue; then pour some of it into strong chloride of lime, and the blue will be bleached with almost magical velocity.
VERITABLE "BLACK" TEA.
Make a cup of strong green tea; dissolve a little green copperas in water, which add to the tea, and its color will be black.