Current Montblanc 146 and 149 usually do not show the problem of blue fingers. With older models, especially from the 1980s and 1990s, a leaking grip section or feed can be responsible; a repair by the dealer sometimes brings only short-term improvement. The causes are varied (microscopic cracks, aged seals, unsuitable ink). 50s models are considered more pleasant by heavy writers, but are mostly more expensive than the current versions.