some of the lights are a little wonky on the magnets ... i usually tell people when the stuff they plate
starts getting "dark" ( instead of greyish, it is dark-greyish / blackish ) it is time to turn it off
because they are plating other "stuff" not just the silver ... as long as they stick it in a non-metalic container
when they run it they are good to go, a metal container will end up electro-plated silver ...
oh, your magnet will hold around 32troy oz of silver on it, it would have paid for itself 12-13 times over if you let it get real-full
have fun !
(and thanks ! )