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| The processing of : Avventurina |
Avventurina is a type of glass which was invented in Murano around 1620. It presents within its mass countless particles of gold, which are really minute copper crystals - copper is its basic coloring agent. The secret of preparing avventurina, known over the centuries to very few expert glassmasters, is, when the fusion is finished, to add multiple small and successive doses of reducing raw materials such as iron shavings, metallic silicon, or coal, until the metallic copper begins to precipitate. An adequate very slow cooling cycle for the molten glass determines the separation of the metallic copper from the glass base. The quality of the avventurina depends on how homogeneously the copper crystals are distributed and how large the copper crystals, which at best can reach one millimeter in size, are. The origin of the term avventurina is clearly indicated by the XVll th century glassmaster Giovanni Darduin: "it is called venturina, and with reason, because it comes more out of fortune ("ventura") video Avventurina processing : http://www.youtube.com/user/muranojewellery/videos?view=0&sort=dd&shelf_id=1
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