The seal matrix dates to between 1250 and 1350, a period covered by the reigns of Henry III, Edward I, Edward II and Edward III An unusual medieval gold seal ... into wax, a clear impression ...
New Scientist on MSN1y
Gold flecks make super-transparent glass fully opaque from one sideThis makes a one-way window that is matte – it looks opaque, reflecting barely 1 per cent of light from the outside – but ...
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