If you are going to dilute a color, we recommend using Arctic Mist since it is specifically formulated to work with our colors. Conditioners may contain oils or silicone, which can prevent the dye from taking properly, which can occasionally result in a patchy application and/or unpredictable results. If you do decide to use a conditioner to dilute a color, choosing one that is colorless, sulfate-free, and silicone-free will give you the best chance at a good result!