ABSTRACT
With regard to classication, Mattiello takes a slightly modied approach, rst assigning the broad general classes: colored, white, black and metallic element and alloy followed by further delineation according to composition and hue (Mattiello, 1946, p. 3):
I. Colored a. Organic i. Synthetic-chemically manufactured ii. Natural b. Inorganic i. Synthetic-chemically manufactured ii. Natural II. White a. Opaque i. Synthetic-chemically manufactured ii. Natural
b. Nonopaque extender i. Synthetic-chemically manufactured ii. Natural III. Black a. Organic i. Synthetic-chemically manufactured ii. Natural b. Inorganic IV. Metallic element and alloy a. Inorganic i. Synthetic-chemically manufactured
Organic pigments are carbon hydrogen derivatives while inorganic pigments are not formed from carbon and hydrogen, but contain metal atoms. To change the solubility of organic molecules, metals can be added to the molecule. Oen, these molecules retain their classication as organic although a metallic component has been added (Mayer, 1991, p. 63). An example of this classication is the phthalocyanines.
