H2 Hardener is a fast drying ink hardener that produces a hard, brittle ink film and causes yellowing of the ink upon UV exposure. The change in color becomes evident in varnishes, whites, and lighter -colored inks. H2 is for use with the following Marabu inks TPR, TPU, TPP, TPY, TPT, TPL. Store H2 in a dry place and close tube immediately after use. H2 is available in 100ml tubes.