I accidentally let a pot sit empty on the range top with the burner turned on. It probably sat there for 10 minutes or so. When I returned to the kitchen it was so hot that the pot's bottom was bowed out and it was teetering on the cooktop surface. I turned off the burner and set the pot to the side. The pot quickly cooled and the bottom was basically flat when it cooled. I hit it with the heel of my hand a couple of times to finish flattening it. I think the base of the pot is copper-over-stainless. The bottom is very thin.
I think the cooktop is ceramic.
When I removed the pot, the whole area where the pot had roasted was cloudy white. After it cooled, I worked for a couple of hours using a combination of towels, rags, a non-scratch scrubber, a Scotchbrite abrasive scrubber, Weiman's cooktop mild abrasive, Softscrub mild abrasive, and sandpaper to remove the cloudiness and most of the thin layer of metal that is fused to the ceramic cooktop. Now I'm down to the thickest part of the deposited metal, and it's really gotten tedious. And I think that the damage I do removing the final bit might be quite visible. After taking the pictures I see I've already caused a lot of damage, but it's not too visible from a distance yet.
1. How the heck did metal that looks like stainless steel transfer through the copper-clad bottom of the pot to the burner? (Yes, I wiped up some reddish deposit that must have been copper too, especially where I sat the pot to cool.)
2. Do you think I can wipe on a little nitric acid to dissolve the metal and then wipe it off? I can leave the doors open to let the fumes dissipate while the reaction occurs. I suppose it would be bad to suck the fumes up through the metal range hood, right?
3. If 50% nitric acid solution is a good idea, where can I get just one ounce of it? I've seen a 500 ml bottle somewhere online, but where could I dispose of the rest? I don't want to do environmental damage.
The pot after a good scrubbing with Scotchbrite and Softscrub.
The cooktop with metal deposition that looks like stainless steel.
Edited by reed201, 02 November 2018 - 03:16 PM.