An ink comprising: (a) 0.5 to 5 parts of a self-dispersible pigment; (b) 2 to 8 parts of a styrene acrylic latex binder and/or a styrene butadiene latex binder; (c) 0.5 to 5 parts of a polyurethane latex binder; (d) 0 to 5 parts of a glycol selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol or triethylene glycol; (e) 1 to 10 parts of 2-pyrrolidone; (f) 1 to 15 parts of glycerol; (g) 0.1 to 3 parts of acetylenic surfactant; (h) 0.001 to 5 parts of biocide; (i) 0 to 10 parts of a viscosity modifier; and (j) the balance to 100 parts water. Also ink jet printing processes, ink-jet ink containers, printed substrates and ink-jet printers.