The manufacturing of stained glass is an ancient technology which dates back so far in fact that the ancient Egyptians knew how to do it 2000 years before the birth of Jesus Christ. Medieval Europe inherited this form of technology but did not invent it as is common belief. Deep, rich blue glass was very difficult to make and therefore needed to be imported from southern Italy. The deep blues which the Chartres cathedral in Chartres, France is so famous for can historically be traced through doc...
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