Speedball 3450 Oil-Based Block Printing Ink For Professional, Permanent Prints AP Certified 1.25 FL OZ, Black TOP-QUALITY PIGMENTS  The oil-based block printing ink from Speedball is specifically designed for professional printing to produce top quality prints. RICH INTENSE COLOR - This black block printing ink produces beautiful, vibrant color. It can be used as is or mixed with other colors to achieve various shades. PERMANENT RESULTS  The oil-based block printing ink will produce a permanent result. The ink is also waterproof. AP CERTIFIED - The Speedball Oil-Based Block Printing Ink is safe for everyone to use. It is ACMI AP Certified and conforms to ASTM D-4236, so it can be used in school or at home.