Potash glass
The name 'potash' is given a range of salts containing potassium (typically oxides, sulphates, chlorides and carbonates) which occur naturally in the earth's surface and, being water-soluble, are subject to a natural, continuous 'recycling' processes. For more information see: Potash.
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, describes potash as: ‘Potassium carbonate, an alkali flux used in glassmaking, obtained from plant ashes.’
It defines potash glass as: ‘Potassium-rich glass, made from plant ashes and dominating from the 10th to the late 16th centuries.’
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