Weird Tone 1992 Cent.

I found a bag of coins in an attic last week at a friends childhood house. It has a very gold tone but also a very deep black tone. I mean charcoal black & goes brown where it meets gold color. My question is how would someone get the gold/black color? I have a mural made of Pennie's that would look perfect with the gold and black but I never toned a coin before only accidentally and usually crappy ugly colors lol. Mind you this penny was in a bag with other coins in an attic of a beach house. The attic got tons of salt water but idk if the bagged protected it as it was plastic and pretty well sealed. Does anyone here know how to get these colors? Gold cents are pretty common from what I read but no one wants to give up their secrets &

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I'm pretty sure gold toning is pretty common on cents right? So should be relatively easy for a noob like me to do it I'm thinking.hoping. But like I said it's for a mural made of 129 Lincoln cents so I can't mess up #128553; only 1 shot.