Modify the opacity of your Speedball Fabric and Acrylic Screen Printing Inks with Speedball Fabric and Acrylic Screen Printing Transparent Base. A 10-15% mixture is all you need to make inks sheer without affecting viscosity or consistency. - Speedball Fabric and Acrylic Screen Printing Transparent Base - GallonSpdball ws Tex Scrnprnt, TRNSPRNT BASE GAL -