| Unidentified photographer (British) [Youth Group by Ocean] 1913 (ca) Thames plate 4 x 5 ins Private collection of Mark Jacobs Courtesy of Mark Jacobs Collection. LL/41546 The Thames Colour Plate, which combined the Thames Colour Screen with emulsion into one unit, was an additive screen process used from 1909 until about 1918. The process was later improved and rereleased as Finlay Colour.
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