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Blue - light/finishing
Yellow - medium
Orange - heavy
Green - super heavy
If the formulations have not changed, I wonder why some of the cut, gloss, and grit removal numbers have? For example, FG 400 was a cut of 9, gloss of 7, and grit removal of 1200. HCC 400 is cut of 8, gloss of 8, grit removal 1500.
Not that it is a big deal, but curious nonetheless.