Final answer:
A strand test is recommended before using the Ultra.Blonde series on color-treated hair to ensure desired results and maintain hair health. Follow instructions carefully, and use conditioning treatments to assist in hair repair.
Step-by-step explanation:
Using the Ultra.Blonde series on color-treated hair is typically acceptable, but there are important considerations to take into account. Color treatments can leave hair more porous and susceptible to damage, which means that any additional chemical processes need to be approached with caution.
It is highly recommended to perform a strand test before applying the product to your entire head. This will give you an indication of how your color-treated hair will react to the Ultra.Blonde product, whether it can achieve the desired lightening effect, and whether it maintains the integrity of your hair.
If the strand test is successful and you're happy with the results, you can proceed with the application, following all instructions carefully. It's also a good idea to use a conditioning treatment alongside or after the bleaching process to help nourish and repair the hair.
As always, if you are unsure or if your hair is highly processed or damaged, consult a professional hairstylist before proceeding.