From my experience collecting these, the reds and greens are the hardest colors to find in the low numbers. But first, we need to distinguish the reds from the magentas. The magentas are reasonably common, but the reds — which are often confused with the magentas — have been tougher for me to find than even the greens. Making things even more confusing, I've seen some that fall somewhere between red and magenta. The blues seem fairly common.
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