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Do you know where this study/review is? I'd love to read it...

This sounds about right.

In general I think that back in the day, speed was highly prized in naturals. Hence all the hyperventilating over Turkish oilstones.

Nowadays when the market is...

Those pictures looked odd to me. Way too yellowy. Even the label looks like it's been soaked in gatorade. Yellow-green eschers are so sought-after that I almost thought someone had used a camera...