Although predominantly working in mezzotint, Turner also produced stipple engravings, aquatints, and etchings. He worked in etching, line and stipple engraving, as well as aquatint. Usually, Baxter used aquatint for landscapes and stipple to work faces and figures. He worked in a variety of media, especially stipple, contour etching and aquatint. He engraved his poetry on glass and invented the stipple engraving for glass. Bessa developed a masterful use of stipple engraving technique, an essential part of colour printing. The process of stipple engraving is described in T.H. Fielding's "Art of Engraving" (1841). Washes, stipple or dotting effects, and "surface tone" in printmaking are other techniques. Holl was a pupil of Benjamin Smith the engraver, and worked in the stipple method. His brother, John Eginton, was a noted stipple engraver. Ben-Day medium uses a raised gelatin stipple image to give tone gradation. A stipple tool allows for the creation of fine dots. Their camouflaging abilities are categorized into four main types including mottle, stipple, uniform, and disruptive. These reactions include the formation of mild mosaic patterns or stipple streak. A stipple pattern can be used to produce an area symbol over the peeled surface.