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I just purchased a gas cylinder touted as being USGI. It was wrapped in a brown paper wrapper in an open USGI can. Is there any way I can be certain the cylinder is in fact USGI?
 

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Stainless steel won't take touchup blue. If you try using touchup blue on a degreased unfinished (hidden) area, and it doesn't take blueing, then that is an indication that it may be USGI, because as far as I know, all commercial gas cylinders are carbon steel and will blue with touchup blue.

Danny

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