HERE ARE THE 10 GOLDEN RULES TO FOLLOW FOR SUCCESSFUL HOME HAIR COLORING:

1. Choose the right shade: This is crucial for a natural-looking result that matches the color promised by the dye. If you have very dark hair, it's best not to choose a very light blonde shade. An oxidative hair dye can only lighten up to 2 shades, so such a drastic change is not achievable with at-home coloring.
2. You can't lighten hair with another color: When dealing with previously colored hair, you can choose a shade that is the same or darker. If you want to lighten your hair, it's better to wait for regrowth or seek professional help.
3. Always perform an allergy test 48 hours in advance: This step is essential and should never be overlooked. Even if you're accustomed to using a similar product, you can't predict how your skin will react, especially considering that formulations may have changed. Conduct a patch test before coloring.
4. Do not mix different shades together: Trust the color result shown on the box when choosing your shade. Mixing different shades together can yield unpredictable color results. 
5. Do not pre-mix the developer and the color cream: The mixture should be prepared and used immediately. After a few hours, it oxidizes and will no longer effectively color your hair, so it cannot be reused.
6. Apply the protective pre-serum on the lengths, but not on the roots: Applying the serum on the roots and scalp can interfere with color absorption.
7. Pay attention to the processing time: The duration varies depending on whether it's your first application or a root touch-up. Follow the instructions provided carefully.
8. Avoid shampooing immediately after rinsing the color: It's better to wait a few days for the color to fully set. Then, incorporate a shampoo specifically designed for colored hair into your routine. Consider sulfate-free options for better color preservation.
9. Don't forget the final nourishing mask to seal the color and prevent hair dryness.
10. Maintain your color with pH-balanced care products like those from the Color Protect range: These products help prevent pigment fading and hydrate the hair fibers. Otherwise, your hair may become dull and lose its shine. For added brilliance, consider using the Huile des Rêves (Hair Oil), which enhances color vibrancy.