Separate the service steps: INtech Pretreatment Shampoo prepares for technical work; Dermal Protector is a colour-service barrier. Hydra-Color Red Corrector is a professional colour component. Neutralizing Shampoo and Mask are post-service care. Rebuild Hair Filler Serum is Step 1 and Hair Cuticle Sealer Step 2; follow the exact salon protocol for the supplied formulas.