Genuine OEM HP PhotoSmart 7510 e-All-in-One - C311a Ink and Supplies
The HP Photosmart 7510 C311a uses HP 564 black, cyan, magenta and yellow, plus a separate photo black cartridge. Standard and XL choices cover all five inks, so photo black should be chosen by its own label rather than confused with the main black cartridge.
Toner Buzz carries genuine HP 564 singles, a three-color pack, a four-color XL set and a standard black two-pack for the 7510 C311a. Choose the photo black cartridge specifically for that ink position, use singles to mix capacities, or select a pack that matches the group of inks you need.