Hair Colour Formulas by Service and Technique

Formulas is where the Academy gets specific. Every page here gives you a working recipe: the shade, the developer, the ratio, the grams, and the processing time, plus the reasoning behind each choice so you can adapt it when the client's hair does not match the diagram.

We write them as answers first — "what developer do you use for a root touch-up at level five grey" — because that is the form the question actually takes when you are standing at the bowl. From there each page walks through the variables that move the result: porosity, resistant grey, banding, heat, and the difference between a formula that covers and a formula that covers beautifully.

Formulas cross-reference the techniques that apply them and the charts they are drawn from, so a single recipe connects to everything you need to execute it. Nothing here replaces a strand test or your own judgement on a new client — it replaces the guesswork.