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Would hydrochloric acid work too, or is that too weak?

I'll see if I can read the makers marks tomorrow.

EDIT: Btw, the right most nicholson file which is still new, do I have to cover it in oil if I want it to stay sharp and free from oxidation?

This morning I spent enjoying the fine weather outside, browsing a flea market.
I bought stuff at several places, only spending cents and an occasional dollar or 2.

I don't yet know what I am...