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Akaga
Litharge: Lead Oxidised in Air, Then Fused
Melted lead left open to the air grows a yellow skin of lead oxide. Melted again, that oxide sets into reddish-yellow scales: litharge, the drier in boiled oil and a flux for glazes and glass. Andrew Ure (1839) describes both steps; in the silver works it ran off the hearth where lead was refined. Lead oxide is poisonous: work outdoors.
The picture: the two forms of lead oxide, red litharge and yellow massicot.
Hejuru
A day at the furnace
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