WINE CHANGED INTO WATER.
Mix a little solution of subacetate of lead with port wine; filter the mixture through blotting paper, and a colourless liquid will pass through; to this add a small quantity of dry salt of tartar, when a spirit will rise, which may be inflamed on the surface of the water.
TWO COLOURLESS TRANSPARENT LIQUIDS BECOME BLACK AND OPAQUE.
Have in one vessel some sulphuric acid, and in another an infusion of nut-galls; they are both colourless and transparent; mix them, and they will become black and opaque.
TWO COLOURLESS FLUIDS MAKE A COLOURED 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 colourless mixtures together into a tumbler, and they will be immediately changed to a bright deep blue colour.
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 colour.