Ink on leather

Be very cautious while using any product to remove ink from leather bag. Since, using the wrong product may damage the finish on the leather and may not remove the ink. If the ink stain is on a pigmented leather then the first thing you can use an Ink Removing Gel specifically formulated for leather but do never use household cleaners as it may damage your bag.
 
I just cleaned my orange cross body, untreated leather handbag with Leather Magic's Nubuck Leather Cleaner and I had great results with restoring it back to its original color. I have also used Leather Magic's Ink & Stain Remover which has gotten out ink stains without ruining the leather. Hopefully this helps!