Description :-This large stone is used for silver and gold testing that is dark and shows results clearly. Use this stone when you need a new high quality surface for your testing chemicals. ...
023A Gold Testing Black Stone 2½" X 1½" X ½" 023B Gold Testing Black Stone 3" X 2" X ½" 023C Gold Testing Black Stone 4" X 2" X ½" 023D Gold Testing Black Stone 6" X 3" X ½" 023E Gold Testing Black Stone 8" X 3" X ½"...