Rub the quads over a sheet of fine sand-paper before applying glue. This roughens the surface of the quads and helps the glue to hold them firmly to the foundation board.
The embossing process described in the foregoing is used for embossing all kinds of printed and lithographed matter on either paper or cardboard. When box wrappers containing holly designs printed in colors, or lettering done in gold ink, gold leaf or gold bronze, are embossed after being printed, the effect is exceedingly beautiful. In the cases of gold ink, gold leaf, or gold bronze, the embossing not only raises the design in sharp relief but also serves in polishing the gold in the same way as burnishing.
SPECIAL PROCESS FOR PRINTING GLAZED WRAPPERS
When printing plates or type forms on highly glazed paper, for box wrappers, labels, etc., a beautiful imitation of lithography may be had by following this process:
Add to either black or blue ink a small quantity of German blue powder—the kind that is carried by a first class drug store but not the kind that is furnished by the average paint dealer. The genuine German blue powder will prevent black or blue printing ink from “picking” or “lifting” the surface of glazed paper in the printing, no matter how bold the face of the plate or type may be. The German blue powder also produces a soft, dull-finish effect in the printing which makes the work appear like lithography.
Add to any shade of red ink a small quantity of Vermilion powder for the same purposes mentioned. Vermilion powder will also do for any shade of brown printing ink.
Add to any shade of green ink a small quantity of Paris green powder.
When adding any of the powders mentioned to the printing ink, use a printers’ pallet knife for mixing the powder into the ink. The mixing should be done on a small sheet of glass or on a stone.
If the printing ink is too heavy in body after the powder has been added, a small quantity of reducer will be needed. Paste dryer, or a few drops of kerosene will do.