What little can be told from a scan, the Willis looks like something I had years ago. I bought a collection of T cards that included a T202 w/Cobb end panel that was 'wet' with some sort of browned oil. Looked like motor oil. I did some research and one conservator said that in cases like that they use progressive soaks in Bestine, a non-staining solvent, to remove as much of the crud as possible. The card did get clean but the white stock grayed as a result and the red changed some. That is how your card looks to me.
Last edited by Exhibitman; 11-03-2021 at 02:11 PM.
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