Our half pound tubes of block brint inks are American manufactured to our own specifications. The Art Advantage™ block print ink mixes easily and usually dries within an hour (depending on atmospheric conditions!). Our water-soluble block printing inks clean up easily with mild soap and water. All colors are non-toxic and conform to ASTM D-4236. Our big tubes weigh in at a half pound, are 5oz by volume or 150cc.