UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

A chemical substance that imparts color to an object by reflecting or transmitting only certain light rays and absorbing all others. For example, a substance that absorbs all but green rays appears green. An object that contains no pigment, on the other hand, appears white because it reflects all light rays and absorbs none. Many troglobites have lost all their pigment [23].