[HexsHeroes]

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. . . My experience with the red borders is that the color will run when damp. Not sure where "moist" ends, and "damp" begins. I think that some of your soiling is actually some transfer of red color from another blanket.

I learned the hard way. I've got a Walter Johnson blanket that was folded in quarters. I wanted to remove the quartering creases, so I used light steam, and ironed the blanket between clean, off-white dish towels. The red borders ran, and now I am sorry I did not leave it as I found it.

Still kicking myself for not accepting a perfectly fine, vintage item as I found it.