Masking Fluid
Watercolor painting often relies on the white of the paper to provide the highlights and lightest areas of tone. Masking fluid helps keep the areas you want untouched by unwelcome color and smudges.

Watercolor painting often relies on the white of the paper to provide the highlights and lightest areas of tone. Masking fluid helps keep the areas you want untouched by unwelcome color and smudges.