L'Oreal DIActivateur 9vol (2.7%) 1000ml. DIActivateur Developer 9-Volume is fully stabilised and buffered to ensure consistent and uniform colour results. Its creamy, rich formulas offer gentle controlled lightening and colouring action. This developer pairs with DIA Light, DIA Richesse and DIA Richesse Hi-Visibility. DIActivateur Developer 9-Volume is great for colour treated hair and sensitised hair; for more luminous colour; for corrective colour/pre-colouration; for permed, smoothed, or straightened hair; and for refreshing and toning highlights.