Nano Brand Dinsink 5x4oz premium pigment ink refill kit for EPSON 69 refillable ink cartridges and EPSON N10 N11 WorkForce 310, 315, 500, 600, 610, 615, 30, 40 printers PH: ~8 Particles: &lt;0.5 micron (Average&lt;100 nano) Temperature: -12C no frozen and 50C no gelling Stability: No setting in 2 years (at normal storage) Lightfastness: 7-8 BWS; Waterfastness: 5 (Excellent); Gasfastness: 5 (Excellent); Rubfastness: 5 (Excellent).