It is nice to have a fountain pen ink that is water proof. However, in this particular case it is at the cost of having an ink that takes forever to dry. This it almost impossible to use for left handed people, and one must accept the fact that when writing on multiple pages, there will be ink smears on the pages that touch each other. It's definitely good to have when signing documents or checks, but one can use a simple permanent pen from any office store for that limited use. Buyer beware!