| 摘要 |
A refill ink with which a used ink cartridge is to be refilled, including: a colorant, a wetting agent, and a surfactant, wherein in a mixed ink formed by mixing a residual ink remaining in the used ink cartridge and the refill ink at a volume ratio (residual ink : refill ink) of 1:1, the number A of coarse particles of 0.5μm or greater in diameter measured immediately after the mixing and the number B of coarse particles of 0.5μm or greater in diameter measured after the mixed ink has been left to stand at 25°C and at RH of 50% for 24 hours satisfy the relationship B/A<=2.
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