Color Photography Explained-4
This shows the third successive stage in separating the elements of a color positive-it is the picture made through the blue-violet dyed gelatine color filter, printed in its complementary yellow. The original color positive with which we started has now been separated into its elements and the next stage, beginning with the following picture, will be to recompose it on paper.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 12 Chapter 6