Travel and Tannins on MSN

Medieval glass was coloured by adding metals to the melt, and several of the colours were effectively lost for centuries

There is a common misunderstanding about coloured windows that makes the craft seem simpler ...
Hackaday

Big Chemistry: Glass

Humans have been chemically modifying their world for far longer than you might think. Long before they had the slightest idea of what was happening chemically, they were turning clay into bricks, ...