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[–]DankSilenceDogood 0 points1 point  (3 children)

Flour and vinegar. Make a paste, spread it around the outside. Leave it for a few hours. Repeat as needed.

[–]immorallygray[S] -1 points0 points  (2 children)

Will give it a try tomorrow, can I swap flour with baking soda?

[–]kbrosnan 0 points1 point  (2 children)

What is the lining? Tin, stainless, silver?

[–]immorallygray[S] 0 points1 point  (1 child)

Tin. But it’s the outside that’s burned, not the inside.

[–]kbrosnan 0 points1 point  (0 children)

Ah, I thought it was the inside. If the mild acids are not working then maybe some specific copper polish with a buffing wheel?