Hi.Gold guy.The use of magnets has been discussed a thousand times.I like to think it is a personal thing.I will not use magnets.Some folks are ok with them but I work super fine gold.Even when oven baked at 500c I still loose gold in the magnetite.so I do not use them..I pan my cons clean,some of the tiniest bits of back will get in the snuffer but almost invisible to the eye.I run the gold I am going to melt threw the blue bowl for about 8 hours.That is about as clean as you can get.then I melt.Good topic interested in knowing your method.Luck,Mcbain.