Watercolor painting is the process of painting with pigments that are mixed with water. Of all the painting processes, watercolor painting is known for its inherent delicacy and subtlety because watercolor art is all about thin washes and transparent color (though watercolors can be made opaque with the addition of Chinese white). Traditionally, watercolor artists work on paper, though the tooth of the surface can vary greatly. Oftentimes the white of the painting surface will gleam through and lend itself to the luminosity of the painting.