The precious resin of Montblanc Meisterstücks shows under direct light a characteristic red transparency, similar to looking through a glass of red wine; this effect counts as a usable authenticity indicator. It is, however, only reliable on Meisterstücks, Starwalker and Bohème, since Generation and Noblesse are made of other material. The light test is not the only authenticity feature but should always be used in combination with further checks (form, proportions, engravings, mechanism).