Hmmm, strange. Here are the original wings with the white texture of Tiff's applied plus bright global lights. I took it to the material room and took an initial screenshot. I changed "feather 1", and you can see in the preview that it changed to red. And the bottom image is the draft render.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi