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A pigment is a material that changes the of reflected or transmitted as the result of -selective absorption. This physical process differs from , , and other forms of , in which a material emits light.
Many materials selectively absorb certain of light. Materials that humans have chosen and developed for use as pigments usually have special properties that make them ideal for coloring other materials. A pigment must have a high tinting strength relative to the materials it colors. It must be stable in solid form at ambient temperatures.
For industrial applications, as well as in the arts, permanence and stability are desirable properties. Pigments that are not permanent are called . Fugitive pigments fade over time, or with exposure to light, while some eventually blacken.
Pigments are used for coloring paint, , , fabric, , and other materials. Most pigments used in and the are dry , usually ground into a fine . This powder is added to a (or binder), a relatively neutral or colorless material that the pigment and gives the paint its adhesion.
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