Cranberry glass (or 'Gold Ruby' glass as it is known in Europe, or 'Rubino Oro' as it is known by glass workers) is a red glass made by adding gold(III) chloride to molten glass. Tin, in the form of stannous chloride, is sometimes added in tiny amounts as a reducing agent. The glass is used primarily in expensive decorations.
Cranberry glass is made in craft production rather than in large quantities, due to the high cost of the gold and the delicate mixing process required. The gold chloride is made by dissolving gold in a solution of nitric acid and hydrochloric acid (aqua regia). The glass is typically hand blown or molded. The finished, hardened glass is a type of colloid, a solid phase (gold) dispersed inside another solid phase (glass).
The origins of cranberry glass making are murky. Some historians believe a form of this glass was first made in the late Roman Empire. The craft was then lost and rediscovered in the 17th century by either Johann Kunckel in Potsdam or by the Florentine glassmaker Antonio Neri in Italy. But neither of them knew the mechanism which yielded the colour. Chemist and winner of the 1925 Nobel Prize in Chemistry Richard Adolf Zsigmondy was able to understand and explain that small colloids of gold were responsible for the red colour.
Legend holds that cranberry glass was first discovered when a noble tossed a gold coin into a mixture of molten glass. This legend is almost certainly not true, as the gold must be dissolved in aqua regia before being added to the molten glass.
Cranberry glass creations were most popular as a table display, often holding confectioneries or flowers. Cranberry glass was also frequently used for wine glasses, decanters, and finger bowls. Cranberry glass was also well-known for its use in "Mary Gregory" glass. This glass had a white enamel fired onto the glass in a design, usually of romantic variety.
- Purple of Cassius
Glass science topics Basics Glass formulation
- Borophosphosilicate glass
- Borosilicate glass
- Ceramic glaze
- Chalcogenide glass
- Cobalt glass
- Cranberry glass
- Crown glass
- Flint glass
- Fluorosilicate glass
- Fused quartz
- Gold ruby glass
- Lead glass
- Milk glass
- Phosphosilicate glass
- Photochromic lens glass
- Silicate glass
- Soda-lime glass
- Sodium hexametaphosphate
- Soluble glass
- Tellurite glass
- Ultra low expansion glass
- Uranium glass
- Vitreous enamel
- Wood's glass
Glass-ceramics Glass preparation Optics Surface modification Diverse topics
Wikimedia Foundation. 2010.
Look at other dictionaries:
cranberry glass — noun : clear ruby glass usually with a blue violet tint * * * reddish pink transparent glassware first made in England and the U.S. in the mid 19th century … Useful english dictionary
cranberry glass — reddish pink transparent glassware first made in England and the U.S. in the mid 19th century. * * * … Universalium
Glass coloring and color marking — may be obtained by 1) addition of coloring ions, by 2) precipitation of nanometer sized colloides (so called striking glasses such as ruby gold  or red selenium ruby ), 3) by colored … Wikipedia
Cranberry (disambiguation) — The cranberry is a group of evergreen dwarf shrubs, bearing the fruit named after such. It is also a color (Hex triplet #A61733), but the following may also refer to Cranberry: Places Cranberry Isles, Maine Cranberry Portage, Manitoba Cranberry… … Wikipedia
Glass — This article is about the material. For other uses, see Glass (disambiguation). Moldavite, a natural glass formed by meteorite impact, from Besednice, Bohemia … Wikipedia
Glass electrode — A glass electrode is a type of ion selective electrode made of a doped glass membrane that is sensitive to a specific ion. It is an important part of the instrumentation for chemical analysis and physico chemical studies. In modern practice,… … Wikipedia
Glass microsphere — For microspheres made of other materials, see Microsphere. SEM micrograph of a glass microsphere in concrete Glass microspheres are microscopic spheres of glass manufactured for a wide variety of uses in research, medicine, consumer goods and… … Wikipedia
Glass transition — The liquid glass transition (or glass transition for short) is the reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle state into a molten or rubber like state … Wikipedia
Glass production — Glass is common in everyday life, from glass windows to glass containers. The manufacture of glass for everyday purposes may involve complexity and automation. This article deals with the mass production of glass. Glass container productionGlass… … Wikipedia
Glass float — in many parts of the world to keep their nets afloat. Large groups of fishnets strung together, sometimes convert|50|mi|km long, were set adrift in the ocean and supported near the surface by hollow glass balls or cylinders containing air to give … Wikipedia