Synthetic brown iron oxide

Single-phase brown oxides of iron can be synthesized by controlled oxidation of black iron oxides. Different tones of brown can be prepared by controlling the oxidation process, and hence controlling the amount of Fe Og (red). Synthetic brown iron oxide is also synthesized by calcination of a-FeOOlT with controlled quantities of manganese compounds. These pigments are not widely used in... 

D 3280 WHITE ZINC PIGMENTS D 3322 PRIMER SURFACES D 3323 SOLVENT/FLAT WALL PAINTS D 3358 WATER BASED FLOOR PAINTS D 3383 SOLVENT/FLOOR PAINTS D 3425 INTERIOR SEMIGLOSS D 3451 POWDER COATINGS D 3619 ANHYDROUS AL-SILICATES D 3721 SYNTHETIC RED IRON OXIDE D 3724 SYNTHETIC BROWN FE-OXIDE... 

Iron Browns. Iron browns are often prepared by blending red, yellow, and black synthetic iron oxides to the desired shade. The most effective mixing can be achieved by blending iron oxide pastes, rather than dry powders. After mixing, the paste has to be dried at temperatures around 100°C, as higher temperatures might result in the decomposition of the temperature-sensitive iron yellows and blacks. Iron browns can also be prepared directiy by heating hydrated ferric oxides in the presence of phosphoric acid, or alkaU phosphates, under atmospheric or increased pressure. The products of precipitation processes, ie, the yellows, blacks, and browns, can also be calcined to reds and browns. 

Iron Oxides. In addition to the black iron oxide, there are several natural and synthetic yellow, brown, and red oxides. As a class, they provide inexpensive but dull, lightfast, chemically resistant, and nontoxic colors. The natural products ate known as ocher, sieima, umber, hematite, and limonite. These include varying amounts of several impurities in particular, the umbers contain manganese. Their use is limited because of low chroma, low tinting strength, and poor gloss retention. 

The continually increasing importance of iron oxide pigments is based on their nontoxicity chemical stability wide variety of colors ranging from yellow, orange, red, brown, to black and low price. Natural and synthetic iron oxide pigments consist of well-defined compounds with known crystal structures [3.1] ... 

Iron Browns. Iron browns are often prepared by blending red. yellow, and black synthetic iron oxides to the desired shade. The most effective mixing can be achieved by blending iron oxide pastes, rather than dry powders. 

RED BURNT SIENNA BURNT UMBER CALCOTONERED COLCOTHAR COLLOIDAL FERRIC OXIDE FERRIC OXIDE INDIAN RED IRON(in) OXIDE IRON OXIDE RED IRON SESQUIOXIDE JEWELER S ROUGE MARS BROWN MARS RED NATURAL IRON OXIDES NATURAL RED OXIDE OCHRE PRUSSIAN BROWN RED IRON OXIDE RED OCHRE ROUGE RUBIGO SIENNA SYNTHETIC IRON OXIDE VENETIAN RED VITRIOL RED YELLOW OXIDE OF IRON... 

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