They roll out consistently and transfer beautifully, resulting in intense, crisp, archival prints. Containing (10) single-pigment colours and a Transparent Base, these professional-grade inks all carry the AP Seal and can clean up easily with soap and water or traditional window cleaner. Most notably, the Speedball Professional Relief series boasts its flagship colour - Speedball Supergraphic Black, created by world-renowned relief artist, Bill Fick.