Look at the first couple inches of the snakes in the first few pictures. To my eyes, the skin in the areas of white scales is lighter, and the skin behind or beneath dark scales is darker. It's most noticeable in the first couple inches on the lower half of the sides of the snakes, where there's a large area of light scales, but it seems to be present in the areas of the narrow crossover rings or bands, too)
(this responds to an earlier thread about whether or not some cal kings, for ex, might have bolder patterns than others, because the skin beneath white bands is white, and the skin beneath black is black; some animals have boldly contrasting scales but the effect is reduced on well-fed animals because dark skin, for ex, shows between white scales)
td
I'd like to see more observations from others based on their animals