Thread: How do you test an unknown natural stone?

If you think it is a finisher I would do just what you are thinking. That way you can tell if it improves the edge or not. If you have higher finishers or another Thuringian you can use it after one of those. Might be able to tell you if its higher than an 8k, but less then a naniwa 12k for example. Atleast that way it will give you an idea where in your progression it would go. Atleast that is what I did when I got a mystery stone that I thought was a Thuringian. I'm still not sure, but I have an idea where to place it.