I noticed that the "bright" rim of the crater looked coal-black in the near IR wavelengths, so I threw together a couple of very quick and dirty color images.

This one uses 653, 483, 440 for RGB. I upped the red slightly, the BG down slightly, and reduced the gamma to bring out details in the plain.

This one uses the same GB, but uses 1000nm for Red. Again, reduced gamma.

Note that since these are from different cameras they don't align perfectly. I did my best to match up, but it ain't perfect.

You'll notice the bright rim turns cyan -- no red. There is a bit of an inadertant red/cyan anaglyph going on since the cameras were in different locations, but taht isn't the whole story. That bright material really does go very dark at near IR (check the raw images), a very sharp dropoff starting between 750 and 800nm. It isn't just my slipshod Photoshop skills!

I'm a bit confused, if I recall, the bright outcrop in our crater got BRIGHTER in near IR. I thought was what Nick showed a few weeks ago, at least. The spheroid things get bluer when you use IR instead of Red -- like in the foreground of my IRGB pic -- but if that far outcrop is more of the "sulfur rich bright crap", it seems odd that it is so dark at near IR. And if that far crater rim is rich in the dark spheroid material, why is it so bright? It's either the wrong color, or the wrong albedo.

Or perhaps it's a trick of the lighting. I don't think so, they were taken just a few minutes apart, and if so why only dark at certain wavelengths? Or maybe I'm confused. Thoughts and wild guesses welcome.