Water-Based Pigments, ContinuedGouachepermanenceGouache is classified by degree of permanence, opacity, and stainingproperties based on tests and research. Select a degree of permanence thatsuits your needs.Permanence is designated according to this table:DesignatorMeaningAA permanent artist-grade pigment.BA moderately permanent, student-grade pigment.CNonpermanent pigment for general public orclassroom use.Opacity is designated according to this table:DesignatorORMeaningOpaque.Reasonably opaque.PPartially transparent.TTransparent.Staining properties are designated according to this table:DesignatorMeaningNMNonstaining and safe to wash over.Moderately safe but, some dyes may bleed into anoverwash.SStainingSSStrongly staining.Continued on next pagel-58
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