I did a little experiment with ribs last weekend. I had 2 racks after I applied mustard on one of them I sprinkled straight paprika then my rub. The other I just used rub after the mustard. When it was all done the paprika rack had a wicked red ring penetrating the meat - almost looked artificial. Maybe I'll post a picture as I still have leftovers. This is something I am going to play with a little more.
-rob
-rob