How to remove ink stain in a leather bag without damaging the color of the bag?
isopropyl alcohol (rubbing alc) will remove ink. I have used it on cars w/leather seats to remove pen stains, and it didn’t damage the seat at all. Still I would try it in a small area–dab with a cotton ball. But I guarantee you if anything will remove the stain, rubbing alcohol will. And it is way cheaper than anything else.