Our colorline apps are very simple and a cost effective way to manage your color use. Choose your natural color, your target color, and the amount of gray. Tap on Formulate and you will be given a formula based on your chosen colorline. You can even choose foil options. Currently these formulas cannot be customized, that option will be available on our PSA (Personal Salon Assistant). You will be able to track formulas to an individual client and customize them accordingly. PSA will be available in July.