Zinc iron brown

Zinc Iron Brown. Variation of the zinc to iron ratio in red-brown iron spinel (ZnFe204), or replacement of some of the iron ions by aluminum and titanium ions, gives light to medium brown pigments. Inclusion of a small proportion of lithium ions considerably improves stability towards reducing agents, e.g., when the pigments are used to color plastics [3.87]. The partial replacement of iron ions by chromium(III) ions yields dark brown products [3.88]. 

Zinc iron brown ZnFe204 [68187-51-9] Pigment Yellow 119 77496 light to medium brown spinel... 

Special types of iron oxide yellows and zinc iron brown can have a moderate heat resistance up to 260°C. Iron oxide reds show limited coloristic properties but excellent heat resistance and fastness properties and are widely used for PP. 

According to Salter (1869) zinc brown was A yellow-brown, so yellow that it might fairly have been classed with the ochrous colours of that denomination, is made by combining zinc with another metal by the aid of heat. It is likely to be zinc iron brown (. v.) however. Riffault et al. (1874) describe blende (zinc sulphide qq.v.) as a brown colour. 

Zinc group Cobalt zinc oxide Franklinite Iron zinc oxide Lead antimony zinc oxide Zinc iron brown Zinc oxide Zinc titanate Zincite Spinel pigments Colour Index (1971) 77377... 

Solutions in contact with polyvinyl chloride can become contaminated with trace amounts of lead, titanium, tin, zinc, iron, magnesium or cadmium from additives used in the manufacture and moulding of PVC. V-Phenyl-2-naphthylamine is a contaminant of solvents and biological materials that have been in contact with black rubber or neoprene (in which it is used as an antioxidant). Although it was only an artefact of the separation procedure it has been isolated as an apparent component of vitamin K preparations, extracts of plant lipids, algae, livers, butter, eye tissue and kidney tissue [Brown Chem Br 3 524 1967]. 

Zinc-iron alloy plating, 9 831 Zinc iron chromite brown spinel formula and DCMA number, 7 348t Zinc Iron Chromite Brown pigment for plastics, 7 369t Zincite... 

Oxides and oxide -hydroxides Iron oxide pigments Chromium oxide pigments Mixed metal oxide pigments chromium oxide cob chromium oxide hydrate green alt green and b lue iron oxide red iron oxide orange chromium rutile orange iron oxide yellow nickel rutile yellow, chromium rutile yellow iron oxide brown zinc iron spinell, Mn-Fe-brown... 

Qualitative Analysis.—The minium is treated with dilute nitric acid effervescence indicates carbonates in the solution the lead is precipitated by means of hydrogen sulphide, the filtrate being tested for zinc, iron, aluminium, calcium and magnesium by the ordinary methods. The brown residue insoluble in nitric acid is heated further with nitric add in presence of either sugar solution or hydrogen peroxide until the lead dioxide is completely dissolved any insoluble residue then remaining may contain lead sulphate, barium sulphate or clay, which may be identified in the usual way. 

The Effect of Browned and Unbrowned Corn Products on Absorption of Zinc, Iron, and Copper in Humans... 

The diet was planned with a test breakfast to compare the availabilities of zinc, iron, and copper from browned corn products (corn flakes) with those from unbrowned corn products (hot corn grit cereal). The breakfast served for all 3 days of the menu cycle at all energy levels was identical, with only the... 

Mixed metal oxide pigments cobalt green and blue chromium rutile orange nickel rutile yellow, chromium rutile yellow zinc iron spinel, Mn-Fe brown... 

Chrome iron brown Cr2H09Zn2 K Zinc potassium chromate... 

According to RifFault et al. (1874) blende is a native zinc sulfide mineral used in the production of zinc white (qq.v.). It is also used as a substitute for zinc and lead whites. The colour varies from white and honey yellow to brown or reddish . The term zinc blende is synonymous with the zinc iron sulfide mineral sphalerite (q.v.). 

In steel-on-steel lubrication with a zinc dialkyl dithiophosphate additive, a complex surface paste appears to form first of zinc particles and iron dithiophosphate. The iron dithiophosphate then thermally degrades to a brown surface film of ZnS, ZnO, FeO, plus some iron and zinc... 

Brown combinations usually contain iron with chromium, zinc, titanium, or aluminum. There are a few without iron that contain chromium, antimony, tin, zinc, manganese, or aluminum. They range from tight tans to dark chocolate. The shades ate not as red as ferric oxide, but the browns are far superior to hydrated iron oxide in brightness and thermal stability. 

Discussion. Minute amounts of beryllium may be readily determined spectrophotometrically by reaction under alkaline conditions with 4-nitrobenzeneazo-orcinol. The reagent is yellow in a basic medium in the presence of beryllium the colour changes to reddish-brown. The zone of optimum alkalinity is rather critical and narrow buffering with boric acid increases the reproducibility. Aluminium, up to about 240 mg per 25 mL, has little influence provided an excess of 1 mole of sodium hydroxide is added for each mole of aluminium present. Other elements which might interfere are removed by preliminary treatment with sodium hydroxide solution, but the possible co-precipitation of beryllium must be considered. Zinc interferes very slightly but can be removed by precipitation as sulphide. Copper interferes seriously, even in such small amounts as are soluble in sodium hydroxide solution. The interference of small amounts of copper, nickel, iron and calcium can be prevented by complexing with EDTA and triethanolamine. 

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