In California where unfortunatly I live to have some of the acids in your possesion is a crime (In posession of a industrail controled chemical) besides this, which at least is easy to get around( dont get caught)..anyway its all just way too much of a pain in the butt. You need large amounts to process, you indeed must be careful, inhaling fumes and posssible splashes on skin means you need chemical grade aprons and gloves ect... Then after the extraction you must nutralize the solution. If i had very old millitary bread boards with lots of actual gold wire inside i suppose then it would be worthwhile. Lots of things have only one millionth of an inch plated..like most new costume jewelery or a cheap plated ring. Older plated items from jewerly contacts had much more gold and if you go back far enough you will find gold contacts not plated. But like i said lots of hassel, lots of time not enough return plus you must put up with the arragant attitude of anyone with a high level of chemistry background thinking that you are a complete moron and couldnt learn in one year what only takes commoin sense and a little time to learn.