Ivory Black,
Bone Black,
Blue Black,
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.