Essentially coloured glass. Glass will have a 'natural' colour of pale green Colours can be added to the glass to the glass mixture by controlling either separately, or together, the furnace conditions and metal-based compounds, and the amount of those additions. These will stain the glass a colour, or can remove colour and/or the clearness of a glass. The addition of the same ingredients can produce different colours in different furnace atmosphere conditions.
Some Medieval stained glass survives, as at Bothal and Blanchland. The individual coloured pieces could be held together by H-shaped Lead (Pb) pieces called cames to create religious scenes of The Bible. William Wailes was a noted stained glass maker of Tyneside. Another style of Medieval glass called grisaille.
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