The Speedball Oil-Based Block Printing Ink is specifically designed for the professional printmaker.  This starter set of ink includes six tubes, 1.25 ounces each, of Oil-Based Block Printing Ink (Blue, Red, Yellow, Green, Black and White).  Each high-quality pigment produces a rich, intense color.  The oil-based ink will produce permanent results and is is also waterproof.  Cure time for fabric is approximately 3 weeks. Clean up after you are done working on your project is fast and easy. 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.