the glass has been open at some Phoenician merchants which, shooting an on the beach, they realized that sand loosened him in a transparent liquid. The first ones you mix glassy they appeared around the III millennium a.c. in Egypt and in Mesopotamia, zones rich in flinty sand, principal component of the glass. The most ancient techniques of workmanship of the glass allowed only the production of objects of redoubts dimensions, for the more destined to ritual uses or to ornamental purpose. The first vases were realized toward 1500 to.C. and the most diffused techniques were those of the fused glass around a soul of sand, of the cut to cold and of the polishing with wheel. Subsequently in Syria, in Egypt and finally in Rome the technique of the blowing developed him that allowed a notable commercial development of the workmanship of the glass. To the beginnings of the x century in the Venetian glassworkses and later in the glassworkses of the island of they Wall up the workmanship of the glass it reached a more systematic and qualitative production assuming real artistic characters. The glass is a hard, fragile and transparent material of wide use in varied applications it is' constituted for 70% by sand silice, added to a 30% of other called substances "fluxes" (firm and mortar) substances that allow during the fusion to lower the temperature and to get a homogeneous and exempt liquid from beads. The glass in its basic composition is colorless, only with the addition to the basic composition of small quantities of mineral, oxides and chemical by-products it is gotten a glass with endless combinations of transparent colors, crayons and alabasters. Cobalt for the gradations of the blue / blue one, gold for the ruby, selenium for the red, iron chrome nickel for the violet, criolite for the white, manganese for the black, cadmium for the yellow, sulphur and resin for the topazes, copper oxide for the green, lead arsenic fluorine for the opals. In the crystal the kick is replaced by the lead, the sodium from the potassium; this mixture of pure substances from glass origin with a tall index of refraction and an elevated brightness. The Venetian glass is a long glass, it discreetly remains that is under conditions of lavorabilità for a long interval, after that you/he/she must be secret to contact of the fire. This allows the complex manipulations and the blowing in thin thickness, typical of the tradition Venetian vetraria. In the furnaces of they Wall up the glass it produces him in wands of various diameters, in all the transparent colors, crayons and with sketches in mosaic millefiori, these materials constitute the first subject for the artistic workmanship of the Venetian Pearls.