Diamine Ancient Copper is a rusty red-brown fountain pen ink with medium shading and medium brown sheen. It dries in 30 seconds in a medium nib on Rhodia and has an average flow. Diamine ink has been made in England since 1864.

• Can cause some crystallization on the pen's nib (nib creep). While this can look alarming when you open your pen, it is generally harmless; it just might take some extra attention when cleaning.