Nano Brand Dinsink 4 Quart (4000ml) Premium Grade Refill Ink for HP 920 and HP 920XL Ink Cartridges for Hewlett Packard OfficeJet 6000, 6500, 7000 printers Stability: No settling in 3 years (at normal storage) Temperature: -15C no frozen, 70C no gelling Lightfastness: 5~6 BWS Gasfastness: 4 (good) Waterfastness: 3 (average)