Color Photography Explained-7
In this picture the blue and red separation negatives are shown as printed in their respective complementary yellow and blue-green colors. Here it will be seen that the yellow and blue-green together make up the spectral green shown in the first print, and that this illustration, together with the last two have each combined to produce one of the three original colors.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 12 Chapter 6