16oz Nano Premium Pigment Black refill Ink for HP Canon Lexmark Dell Brother Cartridges Particles: &lt;0.5 micron (Average&lt;100 nanometer); Stability: No settling in 2 years (at normal storage); Temperature: -12C no frozen and 50C no gelling; Lightfastness: 7-8 BWS; Rubfastness: 5 (Excellent); Waterfastness: 5 (Excellent); Gasfastness: 5 (Excellent).