Indigo violet Professional By Fama permanent professional dye +20vol developer Lifts 1-2 level, evening out slight uneven tone extremely bright color, can be added to another hair dye or use as is Application: Mixing 1 to 1 ratio for resistant hair, or 1-2 for standard color deposit Mix and apply immediately Develop time 30mins to 40mins. Check hair texture and condition before applying Professional use