Click to expand Tap to zoom Marabu HT Hardener by Marabu Save $-232.99 $232.99 | / SKU MARA-HT-1L 1 Liter - $232.99 1 Liter Size 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Marabu HT Hardener is a fast drying ink hardener that produces a hard, brittle ink film and causes yellowing of the ink upon UV exposure.