This page illustrates four of the most common watercolor techniques—blotting, scraping, wet-on-wet, and dry brush.
Blotting and Scraping
Blotting involves removing wet pigment with a sponge or a slightly damp brush. In this painting, artist J.M.W. Turner used blotting to create the flickering illumination from a distant lighthouse at the middle left.
Scraping is using a knife to scrape away dried pigment and expose the paper below. Turner created the bright white highlights on the waves using this technique.