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Lap stones under running water, or you will pull diamonds out, from any plate.

As said, it is probably just clogged, stiff brush and cleanser, can revive a clogged plate,
I like Barkeepers Friend.

The 12k Super/Specialty stone, all the stones in that series, are notorious for loading up. Frequent refreshing/resurfacing is needed and will provide a better honing surface and edge.

A diamond...