Third-party inks can be used in a Montblanc without problem in principle; the warnings of some dealers about suspended particles or quality variations are not borne out in practice. Jansen inks like fir-green or Atlantic blue are praised by forum members for their good flow and strong colours and can even ease start-up problems on the 146. Standardgraph moss-green and Parker Quink as well as Private Reserve Sherwood Green are also popular options, although Sherwood Green dries slowly. Iron-gall ink should only be used in dip-pen holders designed for it, not in a fountain pen. Some inks like Noodler's are regarded as fairly viscous. Very old ink should not be used.