What is Murano Glass ? The processing of glass, third part : Avventurina

 The processing of : Avventurina

www.murrina.it - what is Murano Glass ? The processing of glass, third part : 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

Murano Glass pandora style beads, in authentic Murano glass

www.murrina.it , Pandora style beads in Murano glass, with your logo on the silver core with a minimum order of 500 mixed beads you can engrave your logo / name on the silver core, our factory produces, more than 6,000 beads per day, we are the only company in Murano, Venice, which can produce this beads quantity of certified Murano glass.
( Beware of imitations, and always ask for the certificate: Murano Glass Made in Italy )

Christmas is coming, Christmas Balls in authentic MuranoGlass - Made in Italy

Christmas is coming, #Christmas Balls in authentic #MuranoGlass , www.muranoglass-vases.com , #Christmas Balls in authentic #MuranoGlass,
88 mm in diameter and 280 grams in weight, available in 5 colours,
entirely handmade by Murano master #glassmakers wit
the "lampworking blown technique"

( All our products are exclusively handmade; each article is signed
by our Master Glassmakers. Attached sticker #PromovetroConsortium"
further proves its #Murano origin )

What is Murano Glass ? The processing of glass, first part: Cotizzo - Glass

Murano Glass Processing  of Glass

What is Murano Glass ? The processing of glass, first part: Cotizzo - Glass 

www.murrina.it - Cotizzo - Cristallo in artistic glass production is transparent glass, homogeneous, absolutely colorless.

The secret of quality in cristallo, which is glass, is the 100% purity of the raw materials, the use of bleaching agents, the preparation of the vitrifiable mixture, the fusion process. In the middle of the XVth century #Murano invented a pure and colorless glass, which for the first time in history was called cristallo and was later imitated in other European countries.

In contrast with Nordic crystal, which has a concentration of lead oxide and today must be subject to strict controls of the fumes deriving from its fusion, its contact with foods and its waste disposal, #Murano cristallo is a sodic-calcic glass whose principal components, aside from silica, are sodium oxide and calcium oxide. Murano has always remained faithful to sodic cristallo because it is most suitable for the production of particularly light blown objects which require long working processes.

( Remember that #MuranoGlass is 100% pure and realized only with natural materials; beware of any other types of glass you don't know where they come from, because they can contain unhealthy or polluting agents/components, which can bring to allergies or other problems.