I would re check the file size cuz that chain looks like a garden hoe and your angle is way off. And from my experience at taking out stumps and rocks and cable wires with a saw I can garuntee that chain has seen more than just wood unless you been wackin up RRties. I spent 5 hours brushin this mess today and the fresh chain I put in don't look any where near as filthy as yours.
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View attachment 134168
Just sayin. Practice makes perfect. Keep at it.
I'm not so sure it's filthy from dirt and grime. I think it turned black from burning it after it started smoking. At this point it sounds like you guys think I should have this chain professionally sharpened to repair it.