I often find it difficult to remove the verification ink markings that most labs stamp on PAL Rxs. I currently use Isopropyl Alcohol an find it eventually dissovles the ink. Heating the lens before applying the alcohol assist but if the ink is really been on the lens a while it is really stubborn and can be difficult to remove. I was wondering if anyone has found a safe solvent that can be used on all lens materials for this problem?
Bookmarks