you can't trust old color photos. Can't trust them one bit. They can (and do) give a general hint at the color, but the photo-sensitive chemicals of the day were much more primitive than the modern Kodak Advantix. the colors bled, faded, didn't register properly, etc. Many WW2 photos are "touched up" when scanned, so that they look one way or another, and this further changes the actual appearance of the colors involved.
While color photos HELP, do not trust them as God's word.