A technique commonly used in watercolor (and gouache) painting is the covering technique. With this technique, you cover parts of your artwork so that they do not absorb pigment. Depending on what you intend to do with it further, you can use materials that can be removed or materials that remain permanent.
Here you see a watercolor where the flowers were covered before the green wash was applied. When the wash was completely dry, the masking layer was carefully removed, and the flowers were further developed.
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Read more: Covering Techniques