The GI-23 Gray Ink Bottle is a genuine Canon refill for select MegaTank printers, which hold their ink in built-in tanks rather than cartridges. Dye ink is used here, formulated for deep blacks and smooth tonal transitions in photo output. The bottle has a no-squeeze design and a specially keyed nozzle shape that only fits the matching tank, so pouring in a refill is clean and hard to get wrong.

• Genuine GI-23 ink bottle for select Canon MegaTank printers
• Dye ink formulated for deep, long-lasting blacks
• No-squeeze bottle design with a keyed nozzle that only fits compatible tanks
• Refills the printer's built-in tank — no cartridge to discard