Pigments are solid particle that are dispersed in paints to provide characteristics such as, color, opacity, durability, mechanical strength, and corrosion protection for metallic substrates.
Pigments may be inorganic and organic materials.
Organic pigments are used primarily for decorative purposes, while inorganic materials are used for protective properties.
Extenders are used together with pigments to modify the properties of the paint. The extender has little color strength compared to pigment.
Pigments have to be uniformly dispersed in the binder to provide good appearance. They have to be in suspension or be easy to disperse if it is settle.
A wide variety of coloring agents can be used to provide a considerable range of colors. The number of pigments used and the amount of each is related to color, hiding, and many other film properties.
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