Color Photography - Screen Color Transparencies ( Originally
Published 1938 ) THESE are methods of making by one exposure 1 a
negative which, when developed, can be reversed into a colored
positive. AGFACOLOR ULTRA PLATES.—These are glass plates coated
with a screen consisting of numerous tiny particles of
transparent material dyed with the three primary colors: blue,
green and red. The particles are extremely small, so that even
on projection of the finished plate, they are scarcely
discernible. The color particles act as a mosaic of minute color
filters in perfect balance, through which the exposure is made.
The color screen thus obtained is given a very thin insulating
lacquer coating, and over this is flowed the special
panchromatic emulsion which is made for the plate. Thus, when
the plate is placed in the camera with the glass side toward the
lens and exposed, the light passes through the color screen
first, before it strikes the sensitive coating. When this takes
place, each of the small color particle