HP 761 DesignJet Printhead Grey/Dark Grey. OEM:CH647A. There is no denying their expertise in this field, but the fact that HP has developed over 100 new inks in the last twenty years speaks volumes. Specifically designed in order to work in harmony with your branded appliance, this high quality cartridge delivers vibrant, intense images and text documents and guarantees professional, eye catching results from the very first page to the last. This product is grey/dark grey in colour.