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The exact origin of stained glass is unknown. Its discovery was
suggested by Pliny as an accident by Phoenician sailors. It is possible
that it was a result of shipwrecked sailors building fires for their
cooking pots on blocks of soda (natron) on top of beach sand. By
morning, the melted sand and soda mixture would have produced hardened
glass. It was more likely that potters, from Egypt or Mesopotamia,
discovered the brittle treasure independently, when firing their wares.
Anyone who has painted hand-molded clay in school art classes with a
variety of colored substances, knows that firing in the kiln will lead
to hard-glassy coats. It is likely that the ancients tested many
substances to discover which would generate the most durable and
attractive coating for the otherwise dull and fragile pottery. Trial and
error would have led to a glassy surface, which in turn would lead to
the discovery of glass as an end unto itself.