Slow down the drying process and work at your own pace with Speedball Water-Soluble Block Printing Ink Retarder. Simply add it to your water-soluble inks for block or linoleum printing. It’s especially helpful in warm or dry climates, and it won’t change the viscosity of your ink. Excellent transfer tack ensures even coverage, and there’s minimal odor. Speedball Water-Soluble Block Printing Ink Retarder is gluten free and ACMI AP Certified, so it’s safe for use both at home and in the classroom.