Chromium oxide greens

Chromium hydroxide green is a more bluish and brilliant green than chromium oxide greens. It is quite transparent, and has good strength and excellent stabiUty. It is used in eye makeup and soap. 

Chromium Oxide Green. Chromium oxide green is principally chromic sesquioxide [1308-38-9], (Cl Pigment Green 17, Cl No. 

Hydrated Chromium Oxide Green, pigment for plastics, 7 370t... 

Since chromium(III) oxide is virtually inert, chromium oxide green pigments are remarkably stable. They are insoluble in water, acid, and alkali and are thus extremely stable to sulfur dioxide and in concrete. They are light, weather, and temperature resistant. A change of the tint only occurs above 1000 °C due to particle growth. 

If it is to be used as a pigment in paints and lacquers, chromium oxide green can be subjected to jet milling (micronization) to obtain the required properties (e.g., gloss). 

Except for the expensive cobalt green, chromium oxide is the only green pigment that meets the high color stability requirements for building materials based on lime and cement [3.69]. In plastics, however, chromium oxide green is only of minor importance because of its dull tint. 

Pigment green 50 is a niche player as well. Its relationship to phthalocyanine green parallels that of cobalt blue to phthalocyanine blue. Its opportunities are further constrained by chromium oxide green, which offers similar but not quite comparable performance properties and a similar but less chromatic and dirtier hue at about one-seventh the price. 

An increasing number of colored inorganic pigments are FDA-compliant. Historically, yellow iron oxide, red iron oxide, black iron oxide, zinc ferrite, burnt umber, raw and burnt sienna, channel carbon black, chromium oxide green, ultramarine blue, cobalt blue and copper chrome black have enjoyed FDA—compliant status, under 21 CFR 178.3297, Colorants for Polymers . More recently, the FDA has been successfully petitioned with regard to nickel titanium yellow, chrome titanium yellow, and cobalt green under 21 CFR 170.39, Threshold of Regulation for Substances Used in Food-Contact Articles . 

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. 

Inorganic colorants listed in 21CFR 178.3297 include aluminum, aluminum hydrate, potassium silicate, aluminum silicate, barium sulfate, bentonite, calcium carbonate, calcium silicate, calcium sulfate, carbon black (channel process, prepared by the impingement process from stripped natural gas), chromium oxide green Cr203, cobalt aluminate (with restrictions), diatomaceous earth, iron oxides, kaolin (modified for use in olefin polymers in amounts up to 40%), magnesium oxides, magnesium silicate (talc), sienna, silica, titanium dioxide, titanium dioxide-barium sulfate, ultramarines, zinc carbonate (limited use), zinc chromate (less than 10%), zinc oxide (limited use), and zinc sulfide (less than 10%). 

Chromium oxide Chromium ( ll) oxide Chromium (III) oxide (2 3) Chromium oxide green Chromium oxide greens. See Chromium oxide (Ic)... 

Hydrated chromic sesquioxide Hydrated chromium oxide green Hydrated chromium sesquioxide Pigment green 18 Veridian... 

Hydrated chromic sesquioxide Hydrated chromium oxide green Hydrated chromium sesquioxide. See Chromium hydroxide green Hydrated ferric oxide. See Cl 77492 Iron (III) oxide hydrated Iron oxide yellow monohydrate Hydrated Lime MR-200 Hydrated lime. See Calcium hydroxide... 

Chromium oxide green, chlorinated copper phthalocyanines Aluminum... 

Titanium dioxide (white) Chromium oxide (green) Cadmium yellow (yellow) Cadmium red (red) ... 

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