UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
Yingozi
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.
Osezingeni eliphezulu
A day at the furnace
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