- easy to wipe off - for glass and all smooth surfaces similar to glass - chisel tip 1-5 mm - highly opaque Striking effects and clearly legible notes are guaranteed with this chalk marker 50. The colour covers surfaces extremely well - even dark ones - and is ideal for writing on glass and all other smooth surfaces. The chalk can be wiped off cleanly using either a damp or dry cloth: we recommend Sigel's specially developed Delta microfibre cloth.
