Glassmaking in Egypt

The Video above explains the use of furnaces the make glass in Ancient Egypt. Glass was highly valued in Egypt. Its value was on the level of gemstones and gold. It was used as a diplomatic currency, giving it to foreign governors. For a long time it was thought the Egyptians imported their glass. In 2003 in Quantir  evidence confirmed that Egypt had their own thriving glass industry. What is the reason that no record was left of the glassmaking? There are records of many other types artisans but not glassmaking. It has been hypothesized that it is because the nobles did not own the glass furnaces so they did not leave a record of it in their pyramids or other adorned buildings. It is interesting how they made vessels because glass blowing did not reach Egypt until the 2nd century.The Egyptians put clay forms that were covered with cloth and dipped into molten glass. The glass was then spun to make it even. Then later they scraped out the cavity.(http://www.touregypt.net/historicalessays/lifeinegypt12.htm) An interesting article on the importance of Egyptian glass making is http://news.nationalgeographic.com/news/2005/06/0616_050616_egyptglass.html