This is made of white lead with dryers, and a little led lead to harden it, and further to assist its drying; it is thinned entirely with oil, and should be made very thin, as the new wood, or plaster, sucks it in very fast. It is a frequent practice with painters to save the oil coats by giving the new work a coat of size, or size and water, with a little whiting, called clearcole; but where durability is consulted, this should not be done. The size stops the suction of the wood or plaster, but, at the same time, it prevents the oil paint from adhering to the work; the consequence is, that it is apt to peel or chip off, especially in damp places. Clearcole is sometimes advantageously used on old greasy work, on which oil paint would not dry.
This is white lead thinned with oil and a little turpentine, with suitable dryers. The proportion of dryers for ordinary cases is about one ounce and a half to ten pounds of white lead; but in winter, or under other unfavourable circumstances, the quantity of dryers must be increased.
This is white lead thinned with about three parts of turpentine, and one of oil, also a little dryers. Where much turpentine is used, less dryers is required.