https://en.wikipedia.org/wiki/Charles_Joseph_Hullmandel

During the first half of the 19th century Hullmandel became one of the most important figures in the development of British lithography, and his name appears on the imprints of thousands of lithographic prints. He developed a method for reproducing gradations in tones and for creating the effect of soft colour washes which enabled the printed reproduction of Romantic landscape paintings of the type made popular in England by J. M. W. Turner. Hullmandel's essay The Art of Drawing on Stone (1824) was an important handbook of lithography. In 1843 he went into partnership with Joseph Fowell Walton (born 1812, living 1863), a cousin of the landscape artist and lithographer William Louis Walton, the firm then becoming known as Hullmandel & Walton.