Pigments man-made

Thus the requirement for the use of man-made drugs and dietary additives as veterinary medicines for the treatment of farmed animals is considerable and worth about 100 million pounds sterling annually in the UK ( 104 million in 1994j io jjjg investment in dietary additives such as vitamins, trace minerals, coccidiostats, pigmenters, enzymes and other probiotics to feed compounders in the UK is worth about 110 million, assuming an addition rate of 2.5 kg per tonne and a cost of approximately 3% of the total concentrate dietary cost (calculated from MAFF data, 1995). ° These data can be increased by a factor of about 10 when the compound feed produced within Europe is considered. 

It is believed that CO formation caused by natural burning is also small as compared to the production rate of man-made atmospheric carbon monoxide. The same is probably true in case of the oxidation of terpenoid hydrocarbons emitted by vegetation (see Subsection 3.3.3). However, as Wilks (1959) pointed out green plants can directly emit carbon monoxide due to the photodecomposition of pigments and... 

Artificial marble stone is also known as artificial marble, man-made stone, or artificial resin stone. This series of artificial marble is a high polymer solid material of mixed propyl methacrylate, natural mineral hydrated aluminum oxide powder AKOHlj, and pigment. It is manufactured from specific polymer blends. Also, its size varies from 96" x 30" x 1/2" to 144" x 30" x 1/2". Furthermore, the marble stones are extremely durable and very easy to repair. Since the material is non-porous and naturally resistant to a number of stains and acids, it has been large-scaled by many industries. The material is solid color throughout and both the color and pattern are so uniform all the way through that it can be used for durable countertops. 

Bouherour et al. (2001) Bouherour, S. Berke, H. Wiedemann, H.G. Ancient Man-made Copper Silicate Pigments Studied by Raman Microscopy Chimia 55 (2001)942-951 Boutet (1674) C.B. [Claude Boutet ] Trade de mignature, pour apprendre aisement d peindre ans maitre 2nd ed., Paris (1674)... 

Iron Oxide Pigments. The discovery of iron oxide pigments is lost in antiquity. The cave paintings of early man were made with earth colors composed of iron oxides. Even today, natural iron oxides are still in use. The yellows such as the yellow others and siennas are hydrated ferric oxides (Fe203 H20). The nonhydrated ferric oxides (Fe203) comprise the reds and browns such as the red ochers and brown umbers. The blacks are mixed ferrous and ferric oxides (Fe304 or more precisely Fe0 Fe203). 

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