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I just happened upon this thread, and eventhough it has been a month since the last entry, I couldn't resist adding my two cents.
I agree with using the cerulean blue to tone down the reds. I also like mixing cerulean and cadmium red light together with white for the whites of the eyes.
Another color that I like for toning down the reds is a little chromium oxide green. It has weak tinting strength which makes it great to temper those reds without taking over.