This Daler-Rowney System3 Acrylic Printing Medium is specially formulated for use with System3 Acrylic. The two combines to produce a low-odour water-based screen-printing ink regarded worldwide as the finest of its kind. Using the printing medium slows down on-screen drying of acrylic colour reducing the risk of screen blocking making it easier to wash out.Solvent-free - ideal for use in schools studios and at home.Screens kept moist will wash out easily with soap and water.The medium can be thinned with water even after mixing with printing medium.Excellent colour fastness (over 20+ washes).