His final improvement was the addition of a transparent positive pressure dome, allowing ventilation when the chamber was opened to care for the patient.
2.
Transparent positives of the three images were viewed in Ives'Kromskop ( generically known as a chromoscope or photochromoscope ), which used red, green and blue filters and transparent reflectors to visually combine them into one full-color image.
3.
These were used to reconstitute the full original range of color by projecting transparent positives made from them through similar filters and exactly superimposing the images on the projection screen ( additive color ), or by making three prints consisting of transparent pigment or dye images in the complementary colors and superimposing those to make a single full-color transparency or print on paper ( subtractive color ).
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