Sailor Dipton Dark cave is part of Sailor's ink collection Dipton for dip pens. Dipton is named after the English word dip, and the Japanese word "ton" (an onomatopoeic word that comes from the sound made when a pen nib touches the edge of an ink bottle). Dark cave shifts between blue, purple, and red with a lot of sheen.
Also available in several other colors.
Note! Suitable only for dip pens (not for fountain pens).