Under the caption of grinding bases for ready-mixed paints we have pointed out how this is usually accomplished and that there are several ways of doing this, the most frequent method being to grind the various dry pigments together in oil by established formulas to the consistency of a soft paste, this to be run into or conveyed, as the case may be, to a suitable liquid paint mixer, where additional oil and the drier and volatile thinners or varnish, as called for by formula, are added until the paint has attained standard fluidity and weight per gallon. Here also the tinting colors as required to produce the standard color or shade are introduced, and these, also, should be made rather thin and strained through a wire sieve to keep out lumps or paint skins, because such are very annoying and apt to mislead in the manipulation. But, as stated at that time, it is not essential to the thorough mixing of the paint that the dry pigments be ground together for the base, so long as the various ingredients, that have been previously ground singly in oil, are placed in a liquid paint mixer and beaten up thoroughly before adding the various liquids. So, for instance, white lead in oil, zinc white in oil or these and any extender in oil can be placed in the mixer in certain proportions, so that, when paint is to be made to certain specifications, it is not necessary to make a special grinding to meet requirements, which might at times be rather unhandy and cumbersome.