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You mark the half way point on the blade, so that you can only hone the top half of the razor with the 12k. As you hone, just keep the marker line, on the edge of the stone as a guide. Then compare...

If you want to do a grit comparison, hone a razor with the 8k, mark the half way point with a sharpie on both sides, then hone the top half of the razor, with the 12k keeping the sharpie mark on the...