Final answer:
Semi-permanent hair colors are not designed to lighten or lift the existing natural hair color. They are meant to add tone and deposit color to the hair, lasting for about 4 to 6 weeks.
Step-by-step explanation:
Semi-permanent hair colors are not designed to lighten or lift the existing natural hair color. They are meant to add tone and deposit color to the hair, lasting for about 4 to 6 weeks. However, they do not have the ability to lighten the hair like permanent hair colors or bleach do.