Grinding of glass
Oldest archaeological finds go back to 7000 B.C. That was towards the end of the later Stone Age. The origin of glass was found in countries in the East. The oldest glass making is closely connected with the pottery. During baking of pottery, glass was coincidentally produced as coloured glaze on ceramics.
In about 1500 B.C. they managed to produce glass independently of ceramic base and to form it into single objects.