Apparel printing is a highly evolved yet dynamic activity. In its infancy, the only screen printing inks available were water based. These inks were transparent and suitable for printing only light-colored, 100-percent-cotton materials. The introduction of PVC plastisol inks has revolutionized the industry. Plastisols are opaque and suitable for use on dark as well as light-colored garments. They also enable high productivity by utilizing techniques we currently take for granted, such flashing and high-speed, wet-on-wet printing.