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Purple to Pink

Fuchsine diluted with spirit, as desired. sulphate of peroxide of iron. Mix this with the remaining of the first solution, then add very gradually (to avoid its becoming heated) concentrated sulphuric acid, until a precipitate 2671. Magenta, Solferino, Water of the Nile, and other bright colors may be ob- is formed. The result will be a beautiful blue tained by mixing the various aniline or tar precipitate, equal to Prussian blue. If water colors with water as directed in No. 2497. 2672. To Prevent Show Colors Freezing. It will be sufficient to bring the solution to a strength of about

15 to 20 per cent. of alcohol. Naturally the liquids must be very dilute as regards the solids, so as to suffer no precipitation of any saline matter by cold or spirits. Acetate of copper, with or without ammonia, a dilute solution of iodine in iodide of potassium, nitrate of cobalt, etc., are not acted on by weak alcohol. We believe that glycerine may be mixed with water for this purpose, but whether it possesses any superiority over alcohol we have not been able to ascertain. The bottles in all cases must have sufficient space left over the fluids to allow for expansion.

pigments. These are substances paints, &c. The following receipts furnish the method of preparing the pigments and other coloring matters in general use, and their special appliances. is added, the precipitate is dissolved and the color destroyed; but if the precipitate is separated from the acid and rubbed with phosphate of soda, we obtain a beautiful blue phosphate of iron, which will resist the action of water. In all these cases the acids, which possess no color, are by no means the cause of the blue color, but favor only the production of it, by depriving the mixed hydrates of protoxide and peroxide of iron of certain equivalents of water, and likewise by preventing the same from entering into a higher state of oxidation in the atmosphere.

2677. To Make Carmine by the Langlois Process. Boiling river water, 4 gallons; cochineal in powder, 1 pound; boil for 10 minutes, then add ounce carbonate soda, dissolved in 1 pound water; boil again for an hour; cool, add ounce alum in fine powder, agitate rapidly until it be dissolved, then let it stand for 20 minutes, after which carefully decant into another vessel. The now to be added, and the whole well agitated; apply heat until the liquor be clarified, then draw it off, and allow it to repose for 1/2 an hour, or longer, when the clear portion must