We buy this quite often. It is used in cleaning gemstones we dig around the USA. I have bought from others but this seems to clean better. They are all saying the same description but this seems stronger. This is a dangerous chemical so please use caution when using it. You need to wear a mask and not breathe it. Also make sure you wash it off if you get it on your skin. When you clean with it wash the area several minutes with water to get rid of all traces. I Purchased this at advertised price, no code was given to me. This is a true impartial review of my own for others information of this item.. www.amazon.com/OXALIC-99-6-Crystals-Cleaning-Removal/dp/B0147IFKBY/ref=cm_cr-mr-title
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