BLACKS.

have all the necessary qualifications to be employed.

Ivory black may be employed for all the uses made of it in oil.

Blue black is particularly necessary for landscapes; the blue black generally sold at the colour shops is commonly made of wine stalks; but blue black made of peach, apricot, or plum-stones calcined, is by far the best; it is not so loose and spungy as the former, its colour too is finer.

Bone black is the most valuable of the black tribe for sweetness, and a transparent warmth for landscapes and figures; bone black and white alone will make softer and more natural turning tints than any other colours can produce; the Flemish painters use it very much for glazing.

This black mixed with a little terra di Siena calcined, makes the strongest and sweetest shades that can be obtained with colours.

The best is made of the bones of mutton trotters calcined.