Coloured glass has been excavated at many Palestinian sites, but it was expensive and a luxury until NT times when it became as cheap to produce as pottery.
Citation for glass
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"glass." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 21, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e760>.
Chicago
"glass." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e760 (accessed May 21, 2013).