Genuine OEM HP PSC 1317 Ink and Supplies
The PSC 1317's HP 27/28 and HP 56/57 combos each pair black with tri-color ink. Same-ink twins are a different choice: HP 27 or 56 twins contain black only, and the HP 57 twin contains tri-color only.
Toner Buzz carries genuine HP 27, 28, 56 and 57 ink individually and in these packs, plus HP 58 photo ink. A single focuses on one ink type; either mixed combo covers black and color in the same order.