Finally, they settled on spent coffee grounds as the ideal ingredient for their screen printing ink. The grounds are mixed with vinegar and later strained. The brew is then cooked to let extra fluid evaporate until the mixture mimics the consistency of screen ink. After cooling down, the ink is ready to print. Sounds simple? “There are a few little secrets that we are leaving out simply to honor the countless hours it took for us to begin producing a viable product, however, that’s pretty much it”, says Mohr.