AlchemyGlam: The Magic of Murano Glass
...Murano (a short boat ride off the coast of Venice) in the 13th century, because of the extreme fire hazard posed by the furnaces
The secrets of Venetian glassblowing were zealously guarded, as state secrets, from falling into outside hands once a person became apprenticed in the glassblowing trade, he was by law never again allowed to leave...
