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Try lapping some of the new 12k surface off. I lapped mine several times with a 140 diamond plate and it improved it. It still does not polish like the old pink one, but better near mirror.

Swarf...

“The good folks on the German forums seem to like the 10k Naniwa better than the 12k. I have both. The 10k is softer, it does not seem to be the same base as the 12, and the edge is not that much...

Most synthetics “Nagura” are designed as cleaning/surfacing stones and not so much for making slurry. The red 600 grit stones that came with Naniwa’s were popular a while back, they work very well as...