Alternate Names: Lead Oxide, Lead(II) oxide, Yellow lead oxide
A natural mineral form of pure lead oxide. This is not the same as white lead (this is yellow or orange), although people have commonly used the term litharge to refer to white lead (or lead carbonate).
|Oxides||PbO - Lead Oxide|
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
Generic materials are those with no brand name. Normally they are theoretical, the chemistry portrays what a specimen would be if it had no contamination. Generic materials are helpful in educational situations where students need to study material theory (later they graduate to dealing with real world materials). They are also helpful where the chemistry of an actual material is not known. Often the accuracy of calculations is sufficient using generic materials.
Litharge at Wikipedia