Cleaning copper discoloration from baking

A. Hi Russ. There are numerous copper & brass polishes which with a little mechanical help will polish the copper. Revere Copper Cleaner is offered for the exact purpose of polishing copper after exposure to heat...

But brightening with just a dip and no mechanical assistance requires stronger chemicals. It's possible that sulfuric acid plus hydrogen peroxide will do it. This should be available from a supplier as a proprietary with instructions, the right ratio, and stabilizers to inhibit the decomposition of the peroxide. This dipping service is probably available from a jobshop as a test of whether it will work, and/or if the chemistry is beyond your shop's ability to safely handle. EPI / Electrochemical Products Inc. [a finishing.com supporting advertiser] has a video showing the sequence of cleaning, bright-dipping, and de-oxidizing that should meet your needs by being just a sequential dipping process.

Luck & Regards,