What is that stain on the card?
How do you identify what a stain/soiled spot on a card is composed of? Some are obvious like a 1914/1915 Cracker Jack or T206 Polar Bear but I have no idea about other sets. How do you know if it is candy, tobacco, etc. from the original packaging versus something that happened later in the card's life? I'm interested in what you look for at both the micro (e.g., using loupe) and macro (e.g., looking at scan from auction house or ebay) scales.
Thanks for your insight!
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