Lead Sesquisilicate supplies SiO2 and PbO.
A clear, general purpose lead frit for developing rich, bright surfaces, with an excellent reaction to colours, in particular oxides. Firing Range 860-1040C.Lead Sesquisilicate Frit has 1 molar part of lead to 1.5 of silica. This ratio yield a higher percentage of PbO and thus melts at a slightly lower temperature than lead Bisilicate (1 part lead to 2 silica). 
Only fire in outside or exhaust vented kiln.