Vintage tall art glass coloured vases

2 tall art glass vases. One has a lovely blue colour to it, the other black. Probably 1980s but could be older. Although not an exact pair they look stunning together. A nice pontil mark shows it's hand made - could be Murano 46 cm tall 20 cm wide at base 9 cm wide at opening please note item is advertised with separately vase can be purchased together or separately
 
The history of glass making
 
Stone-age man has used naturally occurring glass obsidian, the black volcanic glass, and tektites to craft weapons and decorative objects.
 
Archaeological findings in Egypt and Eastern Mesopotamia indicate that the first manufactured glass dates back to 3000BC. The oldest fragments of glass vases were found in Mesopotamia in the 16th century BC and they represented the evidence of the origins of the hollow glass industry. Beside Mesopotamia, hollow glass production was also evolving in the same time in Egypt, in Mycenae (Greece), China and North