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Old April 22, 2021, 10:06 AM   #6
Senior Member
Join Date: August 25, 2008
Location: In the valley above the plain
Posts: 12,799
What you describe is an indication of poor chamber seal, as mentioned by others.

But the 'de-coppering' powders, in general, are very dirty. The primary additive for "de-coppering" is usually Tin dioxide or Bismuth. Doing their job requires leaving residue behind. As such, they're dirty powders.
Don't even try it. It's even worse than the internet would lead you to believe.
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