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These are exclusively organic compounds and can be oil soluble azo or polycyclic compounds or metal complexes.  The solvent dyes refers to dye being insoluble in water but soluble in organic solvents. The color range covers the full spectrum.  Being soluble they have a strong tendency to migrate out of a plastic that contains mobile amorphous regions.  For this reason they should only be used in polymers with a high Tg (glass transition temperature) such as polystyrene, acrylic, polycarbonate; where they often display very good all round properties.