Ink Cartridge Refill Kit Bulk ink for HP Printers 4 Quart (4000ml) Color & Black Premium Nano Water-Resistant Pigment Ink Stability: No setting in 3 years (at normal storage) Temperature: -15C no frozen and 70C no gelling Lightfastness: 5-6 BWS Waterfastness: 3 (Average) Gasfastness: 4 (Good)