History of glass
Glass remained a luxury material, and the disasters that overtook Late Bronze Age civilizations seem to have brought glass-making to a halt. It picked up again in its former sites, Syria and Cyprus, in the 9th century BC, when the techniques for making colorless glass were discovered. The first glassmaking "manual" dates back to ca. 650 BC. Instructions on how to make glass are contained in cuneiform tablets discovered in the library of the Assyrian king Ashurbanipal. In Egypt glass-making did not revive until it was reintroduced in Ptolemaic Alexandria. Core-formed vessels and beads were still widely produced, but other techniques came to the fore with experimentation and technological advancements. During the Hellenistic period many new techniques of glass production were introduced and glass began to be used to make larger pieces, notably table wares. Techniques developed during this period include 'slumping' viscous (but not fully molten) glass over a mould in order to form a dish and 'millefiori' (meaning 'thousand flowers') technique, where canes of multicolored glass were sliced and the slices arranged together and fused in a mould to create a mosaic-like effect. It was also during this period that colorless or decolored glass began to be prized and methods for achieving this effect were investigated more fully.
History of glass
The first Persian glass was discovered in the explorations of Dinkhahtepe in Azarbaijan by Burny. It was glass bead from the late Bronze Age (1600 B.C.). Then in the middle Elam era of Chogha, Zanbil Temple existed. Many glass tubes were discovered by French teams. Today it is certain that the mosaic glass cups from the Iron Age of North Iran, such as Hassnlou Tepe, Marlik Tepe. It resembles a number of Mesopotamian examples, in Susa of late Elam, a few glass vessels were discovered, of core forming technique. Also in Azarbaijan and Kordestan, the Gilan provinces, a few kohl tubes were discovered from the late Iron Age that continued into the Achamenid period. In this time achamind bowls and colorless glass growing on empair but in selukid and parthian times helleni and roman techniques were Prevalented and Sassanian era seem local motives on glass vessels.