Dark Red is a great colour for writing - it stands out well but without the stridency of normal bright reds. There are a handful of good quality liquid ink and gel ink rollerball pens available with dark red ink, plus dark red fountain pen ink, fineliners and art pens. Dark Reds are usually called something else by the pen manufacturers - mahogany, red-black, wine, bordeaux, burgundy, etc. We have our own Cult Pens Deep Dark Red ink for fountain pens, which does what it says on the tin.
All our dark red ink products follow below. Use the filters on the left to refine the list to the type of product you're looking for.