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Pigment
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<p>A pigment is a <a href="/facts/Powder/PGd3HwHE">powder</a> used to add or alter <a href="/facts/Color/XDvW7ESP">color</a> or change visual appearance. Pigments are completely or nearly <a href="/facts/Solubility/kLE9h3Jb">insoluble</a> and <a href="/facts/Reactivity_(chemistry)/PuJ2pmRT">chemically unreactive</a> in water or another medium; in contrast, <a href="/facts/Dye/a1NSlcsG">dyes</a> are colored substances which are soluble or go into solution at some stage in their use. Dyes are often <a href="/facts/Organic_compound/gqCNaN45">organic compounds</a> whereas pigments are often <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic</a>. Pigments of prehistoric and historic value include <a href="/facts/Ochre/5ehfU8lA">ochre</a>, <a href="/facts/Charcoal/tpYGBHTn">charcoal</a>, and <a href="/facts/Lapis_lazuli/KKPFyQFN">lapis lazuli</a>. </p>