LION solvent-based, quick dry inkis specially formulated for fast drying time and water-resistance so it's ideal for metal marking or plastic marking.Also applicable for use on other slick or hard surfaces, such as leather, glass, gloss paper, etc. This fast dry industrial ink could be used for rubber stamps, ink pads and pre-inked stamps as long as silicon rubber and cartridge/frame are solvent resistant and tightly covered to avoid exposure to air. Fast dry ink dries in 3 seconds on porous surfaces and 5 minutes on non-porous surfaces under normal temperature (for the best result, allow ink to dry for 48 hours). Due to quick drying nature of the ink, we recommend that the ink pad be covered when not in use. The ink also woks with Lion rubber faced automatic numbering machine MM-21. Proprietary ink formulation will prevent the wheel mechanisms from getting solidified. Low-odor, acid-free and free of hazardous materials such as hormaldehyde, heavy metals or phthalate ester, etc., Much safer to use than other permanent inks. Complies with RoHS and REACH (SVHC) directives, which is the regulation on the use of certain hazardous substances in Europe and is becoming standard worldwide. 1.8oz black ink.