[Austin W Hogan]

The best place to look for original color is under the hammer on a lock, on the back of the frame where it contacts the stock, in the lock recesses in the frame and in the floor plate cut. Color sometimes survives on the back of the fore end latch and both sides of the forend iron.
These colors are difficult to photograph especially with digital cameras. Any stray tungsten light will redden them. Outdoor light under a cloudy sky is best ( Kodak called it Cloudy Bright). A reproducable color standard should be in the frame on at least a few pictures to check.
White mineral oil seems to revive color a little, and add a little uniformity to the surface.

Best, Austin