Chapter 10

forms an amorphous mass with a bronze-like luster; it is sparingly soluble in water, freely so in alcohol, its alcoholic solution being strongly dichroic; its green colored solution in concentrated sulphuric acid becomes successively blue and violet on dilution with water; it dyes silk, wool, and gun cotton, but is not fast to light.

Morphine violet is the first true coloring matter obtained from the natural alkaloids, the morphine blue of Chastaing and Barillot (Compt. Rend., 105, 1012) not being a coloring matter properly so called. --_P. Cazeneuve, Bull. Soc. Chim._

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LIQUID BLUE FOR DYEING.

The new liquid blue of M. Dornemann is intended to avoid the formation of clots, etc., which lead to irregularity in shade, if not to the formation of spots on the textile. In addition to accomplishing this end, the process is accelerated by subjecting the blue to a previous treatment.

In this preliminary treatment of the blue, the object is to remove the sulphur which retards the solution of the color.

The liquid is prepared as follows: The pigment, previously dried at 150° C., is crushed and finely ground, and contains about 47 per cent. of coloring matter; to this is added 53 per cent. of water.

To this mixture, or slurry, the inventor adds an indefinite quantity of glucose and glycerine of 43° B., having a specific gravity of 1.425. It is then ready for use.--_Le Moniteur de la Teinture_.

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