Use a fast drying medium for painting on the go; use it for color studies or to create a masterpiece. Experiment and expand your knowledge of painting, using gouache, an opaque form of watercolor. The reverse of normal transparent watercolor techniques apply, such as working from dark to light or working on a mid-tone paper. Intermediate to advanced painters will improve and build on their current skills while beginners will acquire the core skills needed to work with gouache on their own.