Verdigris?

Is this verdigris?

 

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Can you provide more Pics please? This little Pic. isn't going to do it for me.

 

Looks like a pvc type of mess, here's a pic of verdigris!

 

I could… but it doesn’t show as well with a bigger photo.

 

I think it probably is PVC residue, as fretboard pointed out.

 

I believe it may be copper compounds, after the buffalo was treated with ferric chloride to try and etch the surfaces into appearing as a sharper image ( usually to tell a poor date visibility. If it is left too long, this coloration often appears from the ferric reaction. IMO, Jim

 

I understand what you mean, but I don’t think it was acid dated. The date has depth, which, in my experience, is lacking when acid dated.

 

This is how it the date looks on the crappy digiscope.

 

Could just be environmental, but really can't tell from that one photo. It would help us if you post photos FULL IMAGE.

 

I’m going to try again.

1914 PVC? by NorthKorea posted Apr 22, 2023 at 7:00 AM

1914 by NorthKorea posted Apr 22, 2023 at 7:00 AM

 

I really can’t see it in the small photo.