This ink pad will give you extremely fine detail. An ink that you are able to watercolor or marker over and it won't bleed. This natural oil-based pigment ink dries instantly on matte cardstock. You won't believe it until you see it! This archival inkpad lasts 3-5 times longer than regular inks.Details:Onyx black2.5" x 3.75" inkpad sizeOil-based pigment inkAcid free, non-toxic and fade resistantConforms to ASTM D-4236