The chemistry and technology of printing inks; by Underwood Norman 1878- & Sullivan Thomas V

Author:Underwood, Norman, 1878- & Sullivan, Thomas V.
Language: eng
Format: epub
Tags: Printing ink
Publisher: New York, Van Nostrand company
Published: 1915-03-25T05:00:00+00:00

temperatures, different amounts of grinding and in some cases different precipitating or fixing agents. Of course for the various classes of dyes various precipitating agents are employed and it is a little beyond the scope of this work to enter into details regarding them. The general methods of precipitating and preparing these different classes of lakes, however, are as follows:

In the first case a solution of a certain salt of the carrier is made, the dye mixed in and the precipitating agent added with constant stirring. Thus in the case of a dye to be made on an aluminum hydrate and artifical barytes base, a solution of aluminum sulphate is made and a solution of calcined carbonate of soda is run into it, followed by the dye solution. Barium chloride is then added to the whole and the dye is precipitated and fixed. The more stirring the lake is given at this point the firmer it will be fixed. If, however, there is any unprecipitated coloring matter, more barium chloride is added. It is usual to add the precipitating agent hi excess, as an excess helps in fixing the dye.

The different hues of these and the second class of lakes also are obtained by a variety of methods jealously guarded by the various manufacturers, the most common of which are different strengths of solution, different temperatures either of the precipitating solution or of the solution after precipitation and by mixing a small amount of another dye in the solution. The first two of these methods also exert an influence on the working qualities of the lake, as the temperature and strength of the solutions have a great deal of influence on the physical characteristics of the base.

In the second case the carrier is made into a thin

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