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Restoring iridescence of Chalcopyrite

I would like to cab some chalcopyrite but that will eliminate the iridescence and attractiveness of the stone. Does anyone have any recommendation regarding the best type of acid to use and the procedure for accomplishing this without hurting myself. So far, I have tried plain white vinegar with no real result. I think it could result in a marketable product down the road. Any help would be much appreciated.