Moniq
btw: Red and white colors are easiest seems to me. Some combinations with black and blue are also not possible or not that good as red or white.
Arceuid posted an article on that. TL/DR version; red is the easiest color, black is the hardest. White is technically the second hardest, but is still fairly common simply because there are a lot of folks who craft with mostly/only PR mats.
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