A water based ink composition for a writing instrument comprising at least a colorant, water and a liquid medium, wherein reduced maltooligosaccharide andor reduced isomaltooligosaccharide are added in a proportion of 0. Also disclosed are methods of treatment using the pharmaceutical compositions and preferred dosages for the treatment methods. By configuring a three-dimensional surface topography of the semiconductor layer, an enlargement of the electric contact surface is achieved, without enlarging the surface required for the semiconductor component and without the use of additional materials.