NAON ink: 4x130ml Refill Ink kit for Canon PG-30 PG-40 PG-50 PG-210 CL-31 CL-41 CL-51 CL-211 Black and Color Cartridges World-class Nano-technology! Smell: Normal odor; PH: 6~8; Particles: N/A; Stability: No settling in 3 years (at normal storage); Temperature: -15C no frozen, 70C no gelling; Lightfastness: 5~6 BWS; Waterfastness: 3 (average); Gasfastness: 4 (good); Fast drying time, even on the glossy paper!