Copper coins reactivation technology As per request from many clients to develop a paint to reactivate Ujala function on a magnetic copper coin. A copper ammonia hydrate complex patina along with a catalyst to evaporate ammonia in day light. Cupric sulfate, Ammonium chloride, distilled water and catalyst Thin coating with brush 2 coats. Copper coin activates only in day light. Please don't try yourself at home with out knowing procedure, boiling ammonia is required. Reactivating Anti iron i have failed.