Polymer soluble dyes, also known as polymer dyes or dye solutions, are dyes that are specifically designed to be soluble in polymer matrices. These dyes are formulated to have good solubility in various polymer resins, allowing them to be easily incorporated into the polymer during processing.

Unlike pigments, which are insoluble particles dispersed in a medium, polymer-soluble dyes are molecular-level colorants that dissolve completely in the polymer matrix. This solubility ensures uniform distribution of the dye throughout the polymer, resulting in consistent and vibrant coloration.