doesn't this process involve lots of nasty chemicals to extract the precious metals from circuit boards and the like? i saw an article on Hackady[0] about this

doesn't this process involve lots of nasty chemicals to extract the precious metals from circuit boards and the like? i saw an article on Hackady[0] about this a while back [0] - https://hackaday.com/2013/11/18/salvaging-gold-from-old-electronics/ https://hackaday.com/2013/11/18/salvaging-gold-from-old-elec...