Fritting
Stained Glass Windows: Managing Environmental Deterioration, published by Historic England in 2020, suggests that frit or fritting can refer to:
- ‘In glass painting, a paste of metal-oxide pigments and granules of finely ground glass, fired onto white glass to produce coloured glass. The result is more durable than back enamelling.
- In glass making, the partial fusing of granular raw material as a first stage in the production of glass: crushed silica, fluxes and colourants are combined and heated to temperatures too low for full vitrification, but high enough to remove gases and impurities. This is then cooled, ground and re-melted to make glass.
- In modern solar glass, ceramic paint screen-printed onto modern float glass and then heated to produce a durable light-diffusing coating.’
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, defines fritting as: ‘The process of roasting the glass batch prior to melting.
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