Do you find that red based colored chips tend to fade at a higher temp?
There are anecdotal reports of this happening. I haven't really noticed this per se, as I've never had to do an extended cleaning time with any of the Red chips I cleaned (for some reason, most of the red chips that I have gotten in hand were better condition, and less dirty, than the majority of chips I've cleaned). But given the experience of others, I try to use the lower temperature and shorter times for Reds.
Oh, and I oil most of my chips after cleaning, so the "faded/dry" look doesn't stay.