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yes that is true, as long as you like how the stone performs all else is not important.

Real Nakayama Karasu are long mined out, and are very expensive because they are rare. A cheap Karasu is of either very low quality compared to the true potential of the stone, or they are not mined...

you can clean the rust using BKF (bar keepers friend) found @ Walmart and any other general store, grab a nylon or bristle brush and scrub with it. Rinse very well because its acid based, then dry...