Waterbased Markers, Fine Point, Blue Ink Quick-drying, water-based, nonpermanent inks won't bead or smudge. Write on overhead transparency film or such glossy surfaces as photos, transparency sleeves, slide frames, cromalins, glass, acrylic and vinyl. Correction pen (sold separately) accurately clears film of all Lumocolor markings. Deleted areas can then be immediately remarked. Four-color set includes black, red, blue and green. Eight-color set includes black, red, blue, green, yellow, orange, violet and brown.