Staedtler Lumocolor Pen Superfine Non-Permanent Black (10 Pack) 311-9These universal Lumocolor Pens are ideal for use on overhead projectors and almost all surfaces. The ink is water soluble and fast drying and can be wiped off film using a damp cloth. The polypropylene barrel and cap ensure a long service life and the nib guarantees a superfine 0. 4mm line. Superfine Lumocolor pens Use on almost any surface Non permanent, water soluble ink Fast drying ink to reduce smudging Erase ink using a damp cloth Superfine 0.