I think it is Murano; however, the UV reaction is nothing to do with where it came from. The UV reaction you are seeing is caused by the use of manganese dioxide decoloriser in the clear glass (it is also found in coloured glass for some reason and used as a purple colorant in its own right). Manganese decoloriser was used extensively worldwide for many years when companies did not have access to good quality sand, i.e., iron-free (think coke bottle green for glass made without decoloriser and with iron-containing sand). Manganese became expensive and its use declined towards the end of the 20th C, so it is generally, but not necessarily an age, indicator.
Topic: Yellow art glass bowl/dish (Read 554 times)
