Abstract: Although they have been largely studied, electrochemical dyeing of vat dyes is still at its early stages of development. In this research, we conducted an experimental parameters optimization study to establish more suitable conditions for industrial use. Under these conditions, we tested the electrochemical reduction of Vat Blue 1 (indigoid dye) in lucid, average and dark shades. Furthermore we tested potentiometry at imposed low current as a new control means of the dyeing bath. The colour and fastness evaluations of the obtained samples indicated that the performances of the dyeing operation were similar to those obtained by the conventional method. This result offers new prospects for the electrochemical reduction of Indigo.