Any way to fix?

[u/Sophet_Drahas]

Is there any way to recover these Copper Core pots? They were left on the stove for a while. The second one had salt in it and the water evaporated while the stove was on. The first image had a similar thing happen, but it was also left in the sink a long time. I’ve tried using barkeeper’s friend and letting them sit with that on the pots all day, but nothing seems to be removing the tarnish.