Final answer:
SoRED, a high-lift permanent hair color cream, should be mixed with a developer at a 1:1 ratio for use as a highlighter, following product instructions or professional advice for best results.
Step-by-step explanation:
When using SoRED as a highlighter, it is important to mix it properly to achieve the desired effect. SoRED is a line of high-lift permanent hair color creams from Matrix that provide intense red highlights on dark hair without pre-lightening.
Mixing SoRED typically involves combining the hair color cream with a dedicated developer, usually at a 1:1 ratio. For exact mixing directions and recommended developer volume, always refer to the product's specific instructions or consult with a professional hairstylist.