@EfimLG47 - thank you for the clarification. An optical illusion!
Here's some neat Chavet photos I found on this forum. Maybe one day I'll be able to locate a nice example for myself.
Cool Vintage Chess Photos
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Some people may consider “patina” to be dirt that makes their pieces look ugly.
The bigger problem is the other way around: many people mistake dirt on their pieces with patina and are not able to tell the difference.