| definition | Some watercolor pigments have smaller particles which means that they flow very smoothly and have intense color saturation, for example, the “Pthalo” colors, where others are more sedimentary producing more of a granular effect, for example viridian. Colors that absorb into the paper before the water has had a chance to evaporate; they’re difficult to lift and will leave a stain on the paper. Not an indicator of paint quality as some pigments are inherently staining, and some are non-staining. |