An ink-jet printing process where the ink is printed onto a substrate using an ink-jet printer with an ink re-circulating print-head and where the ink comprises: (a) 0.1 to 10 parts of a self-dispersible pigment; (b) 1 to 20 parts of a latex binder; (c) 5 to 15 parts of one or more polar organic solvent(s) with a solubility parameter at 25°C greater than 27.5; (d) 0.1 to 3 parts of a surfactant; (e) 0.001 to 5 parts of biocide; (f) 0 to 10 parts of a viscosity modifier; (g) 0 to 5 parts of one or more organic solvents with a solubility parameter at 25°C less than 27.5; (h) 0 to 5 parts of a cross linking agent; (i) the balance to 100 parts water: and where the face plate of the ink re-circulating print-head shows a contact angle with water of less than 90°. Also printed substrates, inks, ink-jet ink containers and ink- jet printers.
