These are in paste form furnished in various sizes and styles of packages. The grinding is usually done in a careless way, but more often the goods are simply put through a mixer, and very frequently it may be discovered, that the pigments are not mixed with pure linseed oil, but in a linseed oil emulsion, carrying as much as 33% water. The following formulas, while not prohibitive for cost, are based on pure linseed oil as vehicle.
100 pounds basic lead sulphate (sublimed lead);
American zinc oxide;
Indian red, deep (American);
natural barytes, ordinary fine;
raw linseed oil;
500 pounds finished product.
If the Indian red is in fine division, a very thorough mixing will make this paste smooth enough and thus obviate the necessity for grinding in a mill. The sublimed lead may be replaced by basic lead carbonate (white lead).