chromo

Chromolithography is a method for making multi-colour prints. This type of colour printing stemmed from the process of lithography, and includes all types of lithography that are printed in colour. When chromolithography is used to reproduce photographs, the term photochrome is frequently used. Lithographers sought to find a way to print on flat surfaces with the use of chemicals instead of raised relief or recessed intaglio techniques.Chromolithography became the most successful of several methods of colour printing developed by the 19th century; other methods were developed by printers such as Jacob Christoph Le Blon, George Baxter and Edmund Evans, and mostly relied on using several woodblocks with the colours. Hand-colouring also remained important; elements of the official British Ordnance Survey maps were coloured by hand by boys until 1875. The initial chromolithographic technique involved the use of multiple lithographic stones, one for each colour, and was still extremely expensive when done for the best quality results. Depending on the number of colours present, a chromolithograph could take even very skilled workers months to produce.
However much cheaper prints could be produced by simplifying both the number of colours used, and the refinement of the detail in the image. Cheaper images, like advertisements, relied heavily on an initial black print (not always a lithograph), on which colours were then overprinted. To make an expensive reproduction print, once referred to as a "chromo", a lithographer, with a finished painting in front of him, gradually created and corrected the many stones using proofs to look as much as possible like the painting, sometimes using dozens of layers.Oleograph is sometimes used as a synonym for a chromolithograph, but more properly refers to a chromolithograph that has then been treated to imitate the variable surface of an oil painting, either by brushing with varnish, or some form of embossing or stamping. The print is usually glued to canvas to further the imitation.

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