Subsequent stages in the process have more in common with etching than with lithographic printing. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing. He further developed his woodcut and lithographic technique. Like Friedlaender, these students were expert in the lithographic and etching arts. Fast lithographic 'web' printing presses are commonly used in newspaper production. These are printed using an oversized lithographic press. Chemical mechanical polishing is often used to flatten topography before high-resolution lithographic steps. Others were decorated with coloured lithographic prints copying famous paintings. Gilchreise had 500 lithographic prints reproduced from the original, which Perceval signed. Many of Ravi Varma's original lithographic prints were also lost in the fire. Lithographic copies and plaster casts began circulating among European museums and scholars. In the early 1970s he drew primarily with charcoal, and lithographic crayon on paper. During the course of her life she created several lithographic prints. This is the true lithographic art form. It is one of the leading producers of specialty lithographic components.