This oil-based, waterproof, fade-resistant, acid-free ink is jet black in color and does not bleed when stamped over water-based inks & markers, watercolors, alcohol inks, and acrylic paints. Permanent on matte and gloss paper. Make sure to heat set on glossy surfaces. The ink pad is 4.25″ x 6.25” (108 x 159 mm). Made in the USA.