I'm starting to notice that my charcoal has some sort of residue. I guess I overlooked it before, but now it is quite apparent. When I press hard with my Nitram stick and wipe away the black charcoal, I notice a remaining brownish tone on the paper. I tested someone else's sticks and got the same results. It's OK if I leave a heavy application of charcoal, but if I want to do any type of erasing in technique, the brown stays. I'm not sure if this is inherent with Nitram or I need to find a way to work around this limitation. Time to hunt up some information and reviews.
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