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One tip I learned on these was to double check purity with all blue and all green also. Set it up with the red like the guys have already said, but sometimes a small edge imperfection will show up on one of the other colors but not red, and you can try to touch up the purity on that. Then go back to all red and make sure that didn't get screwed up. Final rule is if you have to choose one color to have better purity, make it the red. Seems like errors in red show up a lot more than green or blue
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