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Looks like rust. Scales look like plastic so probably not Cell Rot unless stored with an off-gassing razor.

You can tape the etch with a layer of Kapton, clear packing or Scotch tape, then cut...

Those lines say a lot about your future, I see a long road trip coming up. I see the coast of California and the state of New Mexico.

Just kidding, it might be Alaska!

I would be more concerned...