When silicate paints are called for, it does not follow that they are to contain silicate of soda or potash (water glass), but that a certain portion of the dry pigment is to consist of silica or silex. Sometimes they are termed silicated paints and, unless otherwise designated, oil paints are referred to. Silicate paints are usually, when called for in white, based on zinc oxide or lithopone for the covering principle and here are a few specimen formulas for paste goods.
200 pounds red seal lithopone (30% ZnS);
" finest floated silica (pure white);
" bolted American Paris white;
" refined or bleached linseed oil;
500 pounds paste.
Note. This is best manipulated in a chaser and smoothed by running over granite rollers.