The addition of 2% diglycol laurate S to regular carbon-ink formulations in place of oleic acid improves the product greatly. When diglycol laurate S is used in a formulation of the following type which is a fairly hard waxy mass, it becomes free flowing and easy to use Diglycol Laurate S/2 "Statex" Black/5 North-Country Refined Carnauba Wax No.3/40 Mineral Oil (100 Viscosity)/38 "Peerless" Black/15