Yep it sure is big...and green. Question is: is this a splash and go or is soaking required? Online opinions seem to vary...thanks
It is stamped with aotoishi(青砥石) so I guess it's an aoto?Don't have the green brick, but I do have a synthetic blue aoto. Have to permasoak that one, it's liable to cracks and breakage if allowed to dry - I've epoxied it back together, and will find some acrylic to epoxy it to soon (it's dry again, left the cover off the container again).
Should make a nice stone for use after a 1k bevel setter, but watch for mud. If it's like my aoto, it's easy to work up a big thick layer, and I'd be concerned about blunting the apex. Light pressure works the best, at least on the blue one you can actually shave stone off if you are careless, and that certainly will remove any apex present....