I removed some of the black metallic covering of my pan, is it still safe to use? I have a Seagull "4 star" "Marathon" "non-stick cookware" pan.
I have decoated much of the black metallic coating of that pan with a stainless metallic scotch brite.

I made the above decoating the above after a few months in which the pan had some matt black carbonated stain with some scratches in it, which kept staying there insistently and no liquid soa[ liquid-soap marination with gentle cloth scotch brite wiping helped.



My problem

First, I am not sure it is still safe to use and second, after removal, one might be able to see a new, even bigger such black "carbonated" stain, appearing around the newly exposed metal.

My question

I removed some of the black metallic covering the pan (and now one part of the metal is exposed and another became blacker → matt black), is it still safe to use?

Update

I tried to pour some well refined sunflower oil and heat it, then most of the uncovered metallic part became yellow (I have no idea how to explain it); this yellowishness didn't come down with a napkin → why wouldn't it?
Looking at the close-up, I'd say that the 'black stain' is where the actual non-stick Teflon coating has already been scratched off.
The bare metal is where you finished the job &amp; also removed the substrate, which was probably used to get the Teflon to stick to the aluminium.

I think you've reached the point where it's simpler to just throw it in the recycle &amp; buy a new one.
Treat it more gently next time - never use metal utensils or scourers on Teflon. Non-Stick tends to only be good for a couple of years at best, so you need to weigh up how much you're willing to spend on one… every couple of years.