Speedball fabric block printing ink extender 75ml tube eachthis speedball fabric block printing ink extender will reduce the opacity of the inks it is mixed with allowing you to create transparent colours while maintaining the correct viscosity for block printingspeedball fabric block printing inks are oil based but non toxic and equipment can easily be cleaned with just soap and water they dry to the touch overnight but must be air dried for 7 days before they go in the wash suitable for