Hello a little time I began all.Hace to research on the golden recovery from electronic scrap. After some frustrated attempts I cocontinued finally a result. At the bottom of the glass a dust sturgeon remains but it is not a sturgeon - orange, not if mine gold or not is. Now I explain my method to him: I put 4 badges of the cell phones in AR 3:1, then I filter and later I add urea dissolved in hot water until it does not bubble. I leave the solution 2 hours and then I add metabisulphite 5-6 spoonfuls, after 12-20 hours I have a hasty sturgeon in the glass but the solution maintains the same color purple sturgeon. Need helps . Thanks.Greetings Ion.