Inorganic materials pigments

Materials. Beside inorganic materials (eg, barium chloride/fluoride crystals, doped with 0.05% samarium), transparent thermoplasts are preferred for the PHB technique, eg, poly (methyl methacrylate) (PMAIA), polycarbonate, and polybutyral doped with small amounts of suitable organic dyes, organic pigments like phthalocyanines, 9-arninoacridine, 1,4-dihydroxyanthraquinone [81-64-1] (quinizarin) (1), and 2,3-dihydroporphyrin (chlorin) (2). 

Pure amorphous polymers, being homogeneous materials, are transparent. Atactic polystyrene is a good example. The crystalline syndiotactic form is not transparent. Alack of transparency does not necessarily indicate crystallinity, however. It can also be caused by inorganic fillers, pigments, gas bubbles (as in a foam), a second polymer phase, etc. 

North American archaeological sites reflect the use of colorants, exemplified by the abundance of die inorganic mineral pigment red ochre in domestic and mortuary contexts in sites from the Clovis through the Mississippian periods (10000 B.P.-1400 A.D.). Typically the presence of these accumulations of pigment minerals is interpreted as material used in ceramics, or for body painting. Color on textiles is not usually considered. 

Micropellet techniques would be attractive because of small sample size, but inorganic materials such as pigments will introduce absorptions of their own and reduce the transmittance of the spectral data of interest (16). 

Inorganic Kind of Material Pigment Cornstarch Fiber Staple Charcoal Briquettes Gelatin Inorganic Chemical... 

The main colourants used are inert inorganic materials such as iron oxide, titanium dioxide and, at small loadings, as previously noted, carbon black. With these materials, white, grey, black, brown, pink and red shades can be developed. Other colours are obtained by organic pigments, which can give bright vibrant colours but carry a cost premium. 

Artificial inorganic pigments, produced by chemical or physical modification of inorganic materials, are, for example, barium sulfate, chromium yellow, cobalt blue, iron oxides, red lead, or titanium dioxide. 

Simple tests can only indicate which polymer type the plastic contains. To identify materials more precisely, it is necessary to use instrumental analytical methods. Each technique provides specific information either about which polymers or which additives are present, so it is usually necessary to use several in combination. For example, gas chromatography-mass spectrometry (GC-MS) is a destructive technique which allows identification of the polymer, plasticizer and other organic components. X-Ray Fluorescence (XRF) spectroscopy is an effective, non-destructive surface technique for identifying inorganic fillers, pigments and metal components, but carmot be used to identify polymers. 

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