I think I see what you are talking about now
The plug was spotless when it was removed, nothing but fine black powder that was finer than talcum powder....as I set this on the table (Outside) to take a picture it fell off the table because wind caught the paper it was on...the big fragments you see are just particles of leaves or something organic...I cleaned it thoroughly before reinstalling to the proper torque. In hindsight I should have gotten a pic before it fell or cleaned it off except for the magnet before taking the pic.
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