I have a white-ish polyamide coat that got stained with black ink in multiple places (long story short, I helped lift a large carton with 1-day-old stamps on it, both on the carton and on the masking tape that was holding it close, and I touched it with my chest).
The ink is from an anonymous bottle given to me to stamp electoral documents. I have no idea of the brand or composition of the ink. It's not from a ready-made tampon.
The incident happened several days ago but I noticed today.
The coat has a feather down inside, so soaking it completely in a bath might not be the best idea. Also, the coat has a polyester interior (not stained, but if I need to bath the whole thing the bath should not ruin it) and plastic buttons and zippers.
I know I need to test everything on some hidden part of the cloth to be sure it works fine.