This is the same product that is used to clean the quartz crystal points and clusters mined at the Ron Coleman Crystal Mine commercial operation. Oxalic acid can be used multiple times with proper storage.
How to clean a crystal? Use this product following the directions included with the Oxalic solution. Approximate weight of this product is 2.05 pounds per bag. This crystal cleaner is an excellent product that we also sell in our Gift Shop. #howtocleanquartzcrystal
Tip: Carefully, check for a film on the crystals after you rinse after soaking. If you feel a film, rinse more. Otherwise, your crystals will have a yellow appearance.