Left over product: can I keep it for next time?
No, you cannot keep a mixture for a future application.
Once the product mixture has been realised, you must immediately apply on your hair. Mixing the ingredients triggers a chemical reaction between the colorant and the developer.
The product is designed to be applied as soon as the two ingredients have been mixed (at the start of the chemical reaction).
Break the self-breaking seal tip, and apply the product to your hair.
Throw away the rest of the product, if there is any, once the application is done.
Always follow the instructions found on your Garnier hair colouring packaging, in order to ensure optimum performances of your Garnier hair colour.