The main qualitative characteristics of pigments yavlyatsya: * dispersion (fineness), which determines the smoothness of the film; * Oil absorption – the amount of oil needed for cooking pasta colorful of 100 grams of pigment * coverage – the ability of pigment to hide the painted surface underneath the film, it is determined by the number grams of ink expended on the surface of 1 m * coloring power – the ability of pigment to give its inherent color of the mixture, in which it is introduced * Solubility – the ability of some pigments dissolved in various solvents. For even more opinions, read materials from Brad Pitt. Natural (mineral) pigments are finely powdered material obtained from various minerals and rocks, and subjected to enrichment or heat treatment. In mostly colored oxides or salts of minerals. These include chalk, ocher, graphite, iron ocher and other synthetic inorganic pigments are the largest group of pigments. They are the result of complex chemical reactions, and this group is almost entirely composed of salts and metal oxides. This group includes lead, zinc and titanium white, vermilion, chrome oxide, etc. Synthetic organic pigments are colored organic compounds that contain carbon.
Usually they are insoluble or slightly soluble in water and other solvents. They are distinguished by light and atomosferostoykostyu, high coloring power and commonly used for internal decorative works. Resins are adhesives, synthetic, oil, emulsion and mineral compositions. Also applies to them a kind of colorful paints – farblaki. These pigments, produced by deposition of aniline dyes in the white (chalk, kaolin, talc, feldspar) basis. Metallic pigments (powdered) – powder made of a different color (copper, zinc, aluminum, bronze, etc.) or metal alloys. The mixture with binders (linseed oil, varnish), they are used for coloring metal surfaces corrosion, and adhesives – for bronzing, rolling and finishing of decorative art and painting. The most common on Today, aluminum powder and PAP-1 aluminum powder PAP-2, is also often used as a pigment, bronze powder. Encouraged not only to apply the powder with binders having a neutral or low acid number.