Hi guys, I know that natural stones have disadvantages. But my experiences have been positive until now. I need advice concerning Arkansas Stones. 1. A Hard Arkansas is mostly pure white. Mine has a larger brown spot that goes through the hole stone. Ok or lack of quality? A pocket stone I own is pure white. 2. Could this be a Surgical Black? It looks so pale. From what I know Surgical Blacks are darker, black or blue-black. But it is tagged, welded and the manufacturer is well known. The Hard Black is darker than the Surgical Black? I know that natural stones are not always the same and can vary in colour. But the Hard Black is rathere grey than black and should be paler. The Hard Black looks familiar; I already have some pocket stones and the pocket stone has the same colour. But every video and photo I have seen shows a Surgical Black being darker, (nearly) black. Some photos following: 1) Surgical Black next to Hard Black 2) Surgical Black 3) Hard (brown spots). 1) Surgical Black vs Hard Black 2) Surgical Black 3) Hard Arkansas Neither the manufacturer nor the retailer answer my contacting. I am grateful for any helpful hints.