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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