Most blue glass is given its color either from cobalt oxide or from copper oxide added to the molten glass. Copper is a more delicate colorant than cobalt. It only requires a small amount of cobalt oxide to produce a deep rich blue. What is blue glass made of? Most Read more…
The value of blue glass varies greatly depending on the condition of the glass and it may differ based on what a seller is asking for it. Reasonably priced vintage cobalt blue selections vary widely in variety and price. A single piece of blue glass may cost anywhere between $15 Read more…
Cobalt can be used to make both soft and hard magnets. What type of magnetic material is cobalt? ferromagnetic metalCobalt is an important ferromagnetic metal. For over 100 years, cobalt’s excellent magnetic properties have helped develop a variety of applications. Cobalt can be used to produce soft as well as Read more…
Properties, Production, Applications and More Cobalt is a shiny, brittle metal that is used to produce strong, corrosion and heat-resistant alloys, permanent magnets and hard metals. Is cobalt shiny? Cobalt is a shiny, gray, brittle metal that is best known for creating an intense blue color in glass and paints. Read more…
The earliest known example of cobalt aluminate glass dates to a lump from about 2000 BC in ancient Mesopotamia, very possibly intended for use as a pigment; it was rare until the modern era. Cobalt oxide smalt appears as a pigment in Egyptian pottery about five centuries later, and soon Read more…
In its natural, unprocessed state, Cobalt isn’t actually blue; it has a color very similar to burnished silver. Once processed, Cobalt can be used to produce bright and vibrant blues that are used in paint pigments. To create cobalt blue, cobalt is heated with aluminum silicates to a whopping 1200°C. Read more…
To create cobalt blue, cobalt is heated with aluminum silicates to a whopping 1200°C. Once treated, the resulting mixture is called Cobalt Blue, with the chemical formula CoAl2O4. A related color, Cobalt Green, carries the chemical formula 4CoO. 3Al2O3. Where does the color cobalt come from? It was the French Read more…
There is a change in the colour of cobalt chloride paper clipped on the lower surfaces of the leaf indicates loss of water vapour from this surface through transpiration. What is the reason for the colour change observed on cobalt chloride paper? Cobalt chloride changes the colour in response to Read more…
Erythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula Co. 3(AsO. 4) 2•8H. 2O. Why is cobalt red? Subsequent determinations of the crystal structures of a variety of compounds have confirmed this view. The red colour of an aqueous solution of cobalt chloride is attributed Read more…
Cobalt(II) oxide, CoO, converts to Co3O4 upon heating at around 600–700 °C in air. Above 900 °C, CoO is stable. These reaction are described by the following equilibrium: 2 Co3O4 ⇌ 6 CoO + O. What happens when a mixture of cobalt oxide and borax is heated? Thus, when reacted Read more…