What is the correct mixing ratio, development time, and after-care routine for this dye?

As an oxidative cream colour, this product must be mixed with a hydrogen peroxide developer (usually 6% / 20 vol for standard coverage, 9% / 30 vol for resistant grey or a lift of up to one level). The standard mixing ratio is 1 part colour cream to 1 part developer by volume — for the 115 ml tube, that means 115 ml of developer. Mix in a non-metallic bowl until smooth. Apply immediately to dry, unwashed hair, starting at the roots if you have regrowth, then pulling through the lengths for the last 10 minutes. Maximum development time is 40 minutes; do not exceed it. Rinse thoroughly with lukewarm water until the water runs clear, then shampoo gently. The included fixing balm with keratin and vitamins is designed for the post-colour step: apply it to towel-dried hair, leave for 3–5 minutes, then rinse. The rice protein in the colour cream helps smooth the cuticle during the process, while the balm reinforces that effect, reducing roughness and improving shine. Avoid heat styling for 24 hours after colouring to let the cuticle fully close.