I see the opposite, that is, the areas where wear should occur, the rim's high spots at each spoke, are black in this picture!
I think it's a machined rim and black pad residue has built up only on the high spots. That might happen readily, depending on the pad material and conditions.
Auburn, CA USA
\r?\n> Could just be the light of the camera, but the front wheel looks like
\r?\n> of mine--bare spots on the anodizing at the spokes. I guess it is
\r?\n> possible on
\r?\n> a gritty ride like Paris-Roubaix to get some wear, but I can't imagine
\r?\n> guys really using the brakes much on a ride like that. And, while again,
\r?\n> could be the camera not showing a second rider in the picture, it appears
\r?\n> the guy on the left us a little slow---everyone else is looking at Tafi.
\r?\n> Deeter, Orlando FL