Editing Mezzotint (section)

===Colour===
[[Jacob Christoph Le Blon]] (1667-1741) used the dark to light method and invented the three and four-colour mezzotint printing technique by using a separate metal plate for each colour.<ref>{{cite book |last1=Le Blon |first1=Jakob Christophe |title=Coloritto; or the Harmony of Colouring in Painting: Reduced to Mechanical Practice under Easy Precepts, and Infallible Rules; Together with some Colour'd Figures. |date= 1725 |url=https://archive.org/details/Colorittoharmon00LeBl |access-date=4 July 2020}}</ref><ref>{{cite journal |last1=Mortimer |first1=Cromwell |title=An Account of Mr. J. C. Le Blon's Principles of Printing, in Imitation of Painting, and of Weaving Tapestry, in the Same Manner as Brocades. |journal=Philosophical Transactions of the Royal Society of London |date=1731 |volume=37 |issue=419 |pages=101–107 |doi=10.1098/rstl.1731.0019 |s2cid=186212141 }}</ref> Le Blon's colour printing method applied the RYB colour model approach whereby red, yellow and blue were used to create a larger range of colour shades. In ''Coloritto'', his book of 1725, Le Blon refers to red, yellow and blue as "primitive" colours and that red and yellow make orange; red and blue, make purple/violet; and blue and yellow make green (Le Blon, 1725, p. 6). A similar process was used in France later in the century by Le Blon's pupil [[Jacques-Fabien Gautier-Dagoty]] and his sons; their work included anatomical illustrations for medical books.<ref>Barker</ref>  Other black and white prints were hand-coloured in [[watercolour]], which was especially useful after the plate became worn.<ref>D'Oench, 76</ref>