Duane,(posted 8533 days ago)We are both sort of right. According to "Photographic Color Printing" the colors are there before development, but change during development creating a mask.
The cyan and magenta image layers are imperfect, in that they react to more than just the desired wavelengths of light. So there needs to be some complimentary color masking to get better, truer color rendition. So the dye couplers in those layers are colored (red for the cyan layer, yellow for the magenta layer) in the base film stock. During development, the dye couplers are used in proportion to the amount of the desired color image density. So in the cyan layer, the more cyan exposure of a given point, the more red dye coupler is used, reducing the red color at that point. But where there is no cyan exposure, the full red color of the dye coupler remains.
So, the orange color is there before development due to the red and yellow colored dye couplers. This is what I saw by fixing some color film. But the MASK is produced during development by changing the density of the red and yellow in proportion to the amount of cyan or magenta exposure.
Voila, both of us are right.
BTW if you did this with old film (prior to 1949), you would not see an orange mask, because that is the year that Kodak introduced this.