To do this lay a clean sheet of paper on the pad, rub it as you did the original, let it remain for a minute and pull it off. Keep on making copies until you have as many as you want or the impression gets too faint.
Fig. 78. pulling an impression from the copygraph
When you get through pulling copies wash the face of the pad with a moist sponge and let it dry thoroughly before you make a new copy.
How to Make Hectograph Inks.
—Black Ink.
—Mix 10 parts of methyl violet; 20 parts of nigrosene; 30 parts of glycerine; 5 parts of gum arabic and 60 parts of alcohol. Heat it until the anilines are dissolved and stir until all are thoroughly mixed.
Red Ink.
—Mix 10 parts of fuchsin, 10 parts of alcohol; 10 parts of glycerine and 50 parts of water. Heat and stir as before.