This powdered citric acid pickle is a safe, way to remove firescale from alloys and metal clay. Many jewelers prefer citric acid pickle to others because it it's a naturally occurring non-toxic compound which works well on gold and silver, doesn't create any noxious fumes and will not be contaminated by steel tweezers or binding wire. The solution will work best when hot. NOTE: Although Nature's Touch Citric Pickle is non-toxic, add baking soda to neutralize and then use plenty of water to flush down drain. Intended for adult use only. Always wear eye protection. Do not ingest. Made In USA