Does Anyone Have an Old Barrel with a Carbon Ring?

[Rocketmandb]

I'm working on a method for removing carbon rings and am in the midst of writing a patent on it. I'd like to do more extensive testing and am looking for old barrels with carbon rings in them? I'd be looking for someone to send me a barrel, I'd do my process on the barrel and send it back - I'll reimburse for shipping. The process is non-abrasive and non-damaging, but I'd still prefer to do it on old barrels. I've successfully tested it on two of my current barrels that had the beginnings of rings forming, but I'd really like to test it on one that's got a whopper of one in it.

Please PM me if able to help.

 

[Rocketmandb]

In case anyone is interested, here are the before and after pics:

Before:

After:

 

[Lwood]

Here is a before and after using Carbon Off. It's a restaurant cleaner used to get baked on carbon off of frying pans and such. Patch it on, wait a few hours and patch it off. I did rinse with water afterwards though.