While
sharing both the opaque quality and convenient dry-time of gouache,
acrylics become entirely insoluble and impermeable when dry.
Gouache allows the blending of already dried colors by reworking
it with a soft, damp brush. In this way one can achieve subtle
shading effects or wholesale revisions throughout the painting
process. If the demands of the project require an underpainting
that is as resilient as an acrylic polymer, acrylic matte medium
can be mixed into gouache to meet these ends.
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