N50 Pentel black : The Pentel N50 Marker is a bullet tip alcohol marker invented in the 1960s. Ideal for multiple uses. Solid aluminum body. Writes on most surfaces. Tip width: 2mm. The ink of the N50 stainer is mainly alcohol based, it is also the main solvent in which the color is diluted. The ink forms an insoluble film on the surface. The strong adhesion that is obtained on smooth surfaces made of non-absorbent materials is due to the addition of resins. The alcoholic components of the ink, the solvents evaporate quickly, thus allowing a film to form on the surface. A great classic for those nostagic for the smell of solvent markers.