Glass is thought to have
been originally discovered by the Phoenician merchants of the first
century. Glass production methods were advanced rapidly by the Romans.
In the 5th century, glass makers discovered that adding
certain metal oxides to the sand and soda mixture produced colors in
the finished glass. It was found that silver turns glass yellow, iron
turns it green, gold makes pink, and gold mixed with copper turns it
rose red, to name a few.
Glass reached its pinnacle in Medieval times, as glass
was produced with outstanding color and strength. It was during this
period that the techniques of glass painting and enameling that Elizabeth uses were perfected.
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