Gouache
The benefit of the gouache paints is that they are used for both opaque and glazed painting techniques. For example, they can be painted on canvas or cardboard in opaque layers of paint. On the other hand, the colors can be diluted with a little water and painted on (watercolor) paper and then create great colour gradients, similar to watercolors. This results in a variety of painting techniques that can be implemented with the gouache colours.