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Screen plate - plate used in early additive forms of color photography.
Scrim - lighting attachment which, when placed in front of a lamp, reduces its strength, usually by one stop, without affecting lighting quality or color.
It was originally introduced in 1932 as a 'screen plate' version, similar to the Autochrome process, but in late 1936 Agfa introduced Agfacolor-Neu transparency film. This technique is based on the patent no. 253335 of Dr.
This process involved the use of a screen plate filter, which dyed dots made from potato starch. The Autochrome was the only available color film until Agfa, the German company, introduced a color film in 1932 called the Agfacolor.
 See also: Plate, Color film, Color coupler, Print, Coupler
  
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