Not being overly critical, but most museums in major cities all have examples of Egyptian and Roman glass works. The ventians probably learned from the Romans who probably learned fron the Egyptians. Who and how glass making and metal crafts got started I don't think anyone knows how or where.
When I worked as a Chemist (those the actuall make new molecules not the pharmacist as in England) I realized most - about 99.99% of what we know we learned from others. Very seldom are we fortunate enough to discover something on our own, and are able to recognize it. Some say there is nothing new that has not been discovered, we are just relearning knowledge that has been lost.
I like you. I visit only: Chinese Doctors and other herbalists. Somewhere we have got lost in the World of Chemicals?????????? We don't 'listen' anymore to the old: Philosophers. Scientists. Biologists etc.