ABSTRACT
A definition of a pigment, as distinct from a dyestuff, has been prepared by the Dry Color Manufacturers’ Association (DCMA) in response to a request from the Toxic Substances Interagency Testing Committee. This definition should clarify the term “pigment” and “dyestuff,” which are often erroneously used interchangeably:
Pigments are colored, black, white, or fluorescent particulate organic and inorganic solids which usually are insoluble in, and essentially physically and chemically unaffected by, the vehicle or substrate in which they are incorporated. They alter appearance by selective absorption and/or by scattering of light.
