Helps prevent check fraud. Uni Super Ink. Check washing is a form of check fraud. Check washing is a process where a thief erases the ink from a stolen check using common household products. Many Uni-ball pens, such as the Uni-ball 207, use a Uni Super Ink, a specially formulated ink that contains color pigments that are absorbed into the check's paper fibers, trapping it from check washing efforts. Made in Japan.