MASSICOT, or YELLOW LEAD, is the calx or ashes of lead, gently calcined, by which it is changed to yellow of lighter or deeper tint, according to the degree of calcination. Massicot is sometimes used by painters, and it serves medicinally as a drier in the composition of ointments or plasters. The massicot which is used by the Dutch as the ground of their glazing, is prepared by calcining a mixture of one hundred weight of clean sand, forty-four pounds of soda and barilla, and thirty pounds of pearl ashes.