Ink contain Pigment and Medium; Pigment can be Organic, Inorganic, Organomettalic (dye stuff) and Medium can be PP Based, Acrylic based,PU based, Vinyl based.
Usually the pigment is dispersedin the diluted medium (with certain kind of solvent).
Where color comes from inorganic?
For inorganic; metal oxide, generally from the metal in transition group in periodic table
Each oxidation state can give different color, for example FeO(reddish), Fe2O3 (yellowish)
Orbital d from the electron structure has empty orbital state, resulting electron movement from one orbital to another orbital. This movement results certain color according to the formula E=h x f (certain frequency give certain color)
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