But there is another method very effectual for making a fine ground on copper-plates; which is the using flake white and fat oil, with any colour required; which being laid on the plates placed in a horizontal position to dry, will polish itself very highly, by the running of the oil. The oil used for this purpose should be thoroughly fat: which, though not at present to be had of the colourmen, may be easily made by the method below taught, with very little expense and trouble; and this method of producing grounds by fat oil, perfectly smooth, secured from any sinking in of the colours, and in all other respects much better than any other, may be practised with advantage on cloths or wood, as well as copper-plates; the cloths being first prepared for that last coat in the manner before directed; and the wood soaked with drying oil.,