Oohhh, this product looks intriguing! I think i would test it out first on a cheap leather item...i think i will buy it, thank you for the link!There's a product on this website but it does some with specifics re: use and effectiveness. Have never tried it myself although I've purchased other products from them. It says for non-permeable leather. Aren't all leathers permeable?
https://www.valentinogaremi.ca/coll...s/products/ink-ball-point-pen-remover-by-avel