Scavo

This is a glass that imitates the effect caused by long periods spent underground, typical of glass objects found during archaelogical diggings. During manufacture, a mixture of several powders is dispersed on the surface of the object at a temperature of about 800 Celsius degrees. This mixture adheres irreversibly and gives the special effect of opaqueness and colouring. To improve adhesion the piece is heated again. The powder mixture contains melting components (carbonates or nitrates) that decompose under heat and act as binders, inert opaquers (talcum, silica, etc.) and sometimes as colouring agents. This technique was introduced in the early 50s by Alfredo Barbini and by Cenedese who were able to use its best effect, applying it in vases and sculptures modelled along archaic lines. Later it gained a remarkable success and was extensively taken up by the Seguso Vetri d'Arte firm during the 70s and in a series of items designed by Giovanni Patrini.