Such is the preparation of oil with which you are to grind your colors, when they are to be much exposed to the injuries of the weather, for they will resist it.
Whence we may justly conclude, that green is not a simple color, but a mixture of blue and yellow as the yellow itself is a compound of red and white.
Set the work in the open air for fear the colors should run, and when they are a little thickened and consolidated, finish drying them before a gentle fire.
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