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High-end waterproof pigment formula + precise adaptation of models:
High fluency anti-blocking head, suitable for mass production
Cost-effective alternative, cost-effective but not quality-reducing
link:https://www.ocbinks.com/ink-cartridges/for-canon-compatible-cartridge/canon-pfi-320-pfi-120-high-end-waterproof.html
Canon PFI-320 / PFI-120 High-End Waterproof Pigment Ink