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It could still be true, but the difference might be minimal. I'd say if they're within a couple of hundredths on average, you call them approximately the same. If they differ by a tenth (in specific...

No reason to suspect anything. Dan's did state that the black was their finest stone at one point. Functionally:
1) there's no real difference between the two, but the advice you got from the rep...

A trans stone that passes light will be a good stone. Dan's black stones are about the same specific gravity and fineness as the best trans stones. Most other black stones aren't as dense and...