Litharge Is Merely Fused Massicot Old Writers Speak Of Litharge Of

silver and litharge of gold, oxides of lead, pale and reddish yellow

respectively. Commercial litharge, especially that which is foreign,

contains sometimes a considerable proportion of oxide of copper and

iron. The principal impurity, however, is generally silica, left

undissolved on treating the litharge with nitric or acetic acid.

Litharge is commonly used in preparing drying oils, which contain a

greater or less amount of the oxide in the form of oleate of lead. Oils

made siccative by means of litharge are therefore liable to be damaged

by foul gas. It is a matter of congratulation that such injury is not

lasting, and that the oil, like white lead, recovers its original colour

on exposure to air and light. Some drying oil which we exposed on a tile

to an atmosphere of sulphuretted hydrogen until it was completely

blackened, regained its former yellow hue on being submitted for a day

or so to air and light. Hence, although the employment of lead as a

siccative is not desirable, its effects are not so deleterious as might

be imagined.

Liquid Sepia Seppia Or Animal Aethiops Is Named After The Sepia London And Nottingham White Flemish White Pattison's White facebooktwittergoogle_plusredditpinterestlinkedinmail