Hello rcouch and Welcome to Mrs. Clean's Forum.
All the information available indicates that there is no guaranteed way to remove ink stains from leather. I have found some detailed information as follows:
Remove Ink Stains From Leather, SuedeOn leather, apply a cleaner, Tannery Vintage Leather Cleaner & Conditioner. On suede, try gingerly applying a dry-cleaning solvent. Dab it on with a clean cloth, after testing on a hidden seam. Allow to air dry. On leather only, follow with Tannery Vintage Leather Cleaner & Conditioner or Fiebing's Saddle Soap to condition the leather. Caution: There is no guaranteed way to remove this stain from these materials.
Most sites recommend trying rubbing alcohol or nail polish remover. I would be very careful about trying this and be sure to test in an inconspicuous place first. (Always follow manufacturers cleaning recommendations if you have them.)
Here's a stain removal guide: (
a list of stains and products to remove them).
Good luck and let me know if you need additional information,
Mrs. Clean