Artverum® Chalk Marker 50. Have you ever quickly jotted down a note on a magnetic board only to be frustrated by the marker losing its ink while writing? More smudges than a thick, clearly visible line? Then it's time to switch: Sigel has designed this special marker for its eponymous glass magnetic board. The liquid chalk provides a consistently uniform writing appearance on the glass surface and can be easily wiped off despite its high opacity. Developed as "non-permanent," the writing can be removed without residue, both wet and dry. Sigel recommends storing the pen tightly closed, either horizontally or with the tip facing down. The Artverum® Chalk Marker 50 from Sigel features a slanted chisel tip with a desired variable line thickness (1-5 mm).