Sounds gross, I know. Standard water based inks are great for lighter colored garments but tend to look washed out or faded when printed on darker garments. Discharge printing was introduced as a form of water based ink that acts almost as a bleach, removing the dye from the fabric. A chemical reaction takes place once heat is applied to the the printed garment, where the discharge agent deactivates the dye in the fabric, allowing the ink to show up as if it were printed on a white t-shirt. The end result is a vibrant colored, very comfortable, super soft print.