History of glass
The history of glass-making dates back to at least 3600 years ago in Mesopotamia. However, they may have been producing second-rate copies of glass objects from Egypt, where this complex craft originated. Other archaeological evidence suggests that the first true glass was made in coastal north Syria, Mesopotamia or Egypt. The earliest known glass objects, of the mid second millennium BC, were beads, perhaps initially created as the accidental by-products of metal-working (slags) or during the production of faience, a pre-glass vitreous material made by a process similar to glazing. Glass products remained a luxury until the disasters that overtook the late Bronze Age civilizations seemingly brought glass-making to a halt.
Zlatno, Poltár District
Production of glass started in the village in 1833. Products had been transported to several world exhibitions. In the middle of 19th century came to Zlatno Leo Valentin Pantoček. He invented the way how to produce the glass money. Later this technique was named as hyaloplastics. In 1856 followed the invention of iris glass. A lot of production had been exported to United Kingdom and United States. 
In Zlatno had been a glasswork museum, which, however, ceased to exist. The glass factory stopped its production in 2003. However, several private companies continue in glass production.