Mix thoroughly and strain through fine mesh:

30 pounds drop black, ground in japan;

35 "

black asphaltum varnish, "B";

35 "

gum spirits of turpentine;

100 pounds = 12 gallons.

The drop black does not require to be of the highest grade, but should be ground fine. This black is not so well adapted for dipping, as it is for application with an ordinary flat varnish brush or a spraying brush.