Cobalt aluminate blue

Cobalt alloys, 7 219-226. See also Cobalt high temperature alloys for orthopedic devices, 3 728 selenium and metallurgy of, 22 98 Cobalt alloy T-800, 7 223 properties, 7 223t CobaltCII) aluminate, uses, 7 241t Cobalt aluminate blue spinel, formula and DCMA number, 7 348t Cobalt Aluminate Blue, pigment for plastics, 7 370t... 

Zinc Chrome Cobalt Aluminate Blue pigment for plastics, 7 370t Zinc chromite... 

Regulated Colorants That Are FDA Approved. It often seems a contradiction that many of the colorants that are suitable for use in food contact applications must also appear on an MSDS as a reportable or hazardous material. Examples include zinc oxide and zinc sulfide, both zinc compounds chromium oxide green (pigment green 17), a chromium compound carbon black and cobalt aluminate blue (pigment blue 28), which is not only reportable because of its cobalt content but is also a suspected carcinogen. 

Blue Inorganic Cobalt aluminate Blue 28 Excellent weatherability and high cost, compared with ultramarine blue... 

Cobalt ahiminate blue Cobalt aluminate blue spinel Cobalt aluminate spinel. See Cobalt aluminum oxide... 

Synonyms Cl 77346 Cobalt aluminate blue Cobalt aluminate blue spinel ... 

Cobalt chloride, 1% petrolatum (cobalt aluminate blue pigment)... 

Fe, Co, Ni. This provides a range of colours in which the excellent durability characteristics of the host crystal structures are retained. An important commercial example of a mixed oxide pigment based on the spinel lattice is cobalt aluminate blue (Cl Pigment Blue 28), which is usually represented as C0AI2O4,... 

This body has devised a scheme for the classification of pigments, based on the chemical and structural identity of the colouring substance. It excludes single metal oxides and non-oxide pigments (q.v.) but includes all mixed metal oxides in one of 14 crystal classes and over 50 pigment categories, each having a specific DCMA Number (E.g. Crystal class XIII is spinel and DCMA No 13-26-2 refers to cobalt aluminate blue spinel. 

Combinations of cobalt(II) oxide and aluminum oxide in the spinel stoichiometry give cobalt aluminate blue spinels, C0AI2O4, C.I. Pigment Blue 28. Variations of this pigment include modification by zinc (C.I. Pigment Blue 72), magnesium, titanium, and lithium oxides. If lithium and titanium modifiers are added, a turquoise blue pigment is obtained. 

Cobalt aluminate blues are the most durable blue pigments commercially available. They have excellent chemical and heat stability, and can be used in chemically aggressive environments and exterior durable applications vithout color fade. One drawback is that these blues are poor UV absorbers when compared to other CICPs. 

Thenard A process for making white lead pigment (basic lead carbonate) by boiling litharge (lead monoxide) with lead acetate solution and passing carbon dioxide gas into the suspension. L.J. Thenard (1777 to 1857) was an eminent French chemist, more famous for his invention of Thenard s blue (cobalt aluminate). 

The facile formation of a yellow, sparingly soluble complex salt of the composition K3[Co(N02)6] has been used as a simple qualitative test for cobalt ions in solution. A more sensitive test is based on the formation of the intensely blue cobalt aluminate, CoO AI2O3, a pigment also known as The-nard s Blue. A spot-test utilizing a-nitroso-a-naphthol allows detection of 0.05 pg of Co at a dilution of up to 1 1000000. 

Blue Ultramarine blue pigments are sodium/aluminum sulfide-silicate complexes. They are used in PP and HOPE, but they have poor resistance to acidic and alkaline outdoor environments. "Cobalt blue" (cobalt aluminate) is a higher-cost, more weatherable alternative. Ferric ammonium ferrocyanide "iron blue" has been used in LDPE bags, for example. 

Cobalt aluminate spinel Cobalt blue Pigment blue 28 Thenard s blue Empirical AI2C0O,... 

Blue Cobalt aluminate Cobalt blue Iron blue Ultramarine blue Phthalocyanine... 

Matt Blue. A colour for pottery decoration depending on the formation of cobalt aluminate zinc oxide is usually added, a quoted recipe being 60%... 

Like the cobalt aluminates, cobalt chromium aluminates have excellent heat stability and weatherfastness. In many cases they have significantly better UV opacity than the Pigment Blue 28 grades. 

Cobalt Blue n (1835) Co0-Al203. Pigment Blue 28 (77346). Bright blue pigment, which is a complex product derived from oxides of cobalt and aluminum. It has excellent lightfastness and good chemical and heat resistance and with low opacity. Density, 4.2-4.3 g/cm (35.0-35.8 Ib/gal) O.A., 27-36 particle size, 0.5-1.0 pm. Syn Azure Blue, Cobalt Aluminate, Cobalt Ultramarine, Dumont s Blue, Enamel Blue,... 

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