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Organic vs Inorganic Pigments
The difference between Organic Pigments and Inorganic Pigments are based upon three principle factors. These three principle factors are given as follows:

Molecular structure of the pigments

Carbon chains or carbon rings are always present in the molecules of the Organic Pigments. As carbon element is associated with nitrogen and sulphur elements of the same class of the atomic table, so, sometimes in the molecules of the organic pigments, the atoms of nitrogen and sulphur atoms are also found along with the carbon atoms. Examples: Azo, pythalocyanine, diazo and anthraquinone pigments.

In the molecules of the Inorganic Pigments, the cations of metal are found in an array form with the non-metallic anions. This arrangement doesn't allow these pigments to dissolve in the solvent and plastic. Examples: Iron oxide yellow, black, red and tan pigments.

Source from where they are derived

The main source of organic pigments are plants and plant products. The inorganic pigments are manufactured from topical cosmetic and also from dirt.

The differences between Organic and Inorganic pigments

Particulars Inorganic Pigments Organic Pigments
Source Minerals Chemically refined oil
Color Often dull Bright
Dyeing/Coloring Strength Low High
Opacity Opaque Transparent
Light fastness Very good Vary from poor to good
Solubility Insoluble in solvents Have have little degree of solubility
Degree of safety May be unsafe Usually safe
Chemical Stability Often sensitive Usually good
Cost Moderate Mostly too expensive


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