I ordered some acids to test some scrap but the stone that came with it it is very small and seems to be a perfect piece of junk. I did a little research and there are a few different type of natural stones, Danube, Arkansas and other natural stones. I had a Mizar24 but got rid of it because I just couldn't trust it so I'm new to the scratch test thing.
Any opinions on size and type would be appreciated. I will be testing alot of silver also so I hope that doesn't make a differende.
Thanks in advance!