This paper describes a new process for making zinc sulfide pigment from fiber industry waste. Technical-grade ZnO and high-quality ZnS were made in an environmentally clean manner, without any other waste product being produced. The equation and rate of ZnO dissolution (0.114 L-3/4 mol(-3/4) min(-1)), as well as an empirical equation for determining the rate of ZnS precipitation, were found. Calculated and experimental data were in good agreement (<15%).