Four pens, four inks, pick your champion (favorite).
1) A new TWSBI Demonstrator modified with a 120 year old Waterman 52 nib, fine point. KWZ's gold Iron-gall ink (starts light yellow, turns black after 30 seconds).
2) An actual 120 year old waterman 52 with broad nib. Diamine's Skull & Roses ink. This ink has a very unique sheen I've never seen in an ink.
3) A Pilot Falcon with extra food be nib. Diamine's Burnt Sienna ink.
4) Pilot Custom 912 with a modified nib (Mottishaw Spencerian Modification). Sailor Carbon Black pigment ink.