All paints are pigment plus binder (medium) plus solvent. All paints use the same pigments for color. Watercolor uses gum arabic as the binder and water as the solvent. Pigments used for watercolor paints are very finely ground and each has its own characteristics. Watercolor paints are rated according to their lightfastness, usually receiving a I, II, III, IV, or VI being excellent and V meaning it is very unstable and will bleach out in a short period of time.
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