Can I Use Henna with Color Treated Hair?

You may put henna on hair that has been PREVIOUSLY dyed with chemicals. Because most chemically treated dyes contain ammonia, it is very important to wait between 6 and 8 weeks to henna your hair. This is non-negotiable. If you do not wait you could end up with orange hair.

You may also chemically dye your hair AFTER you have henna'd it. You will have to wait between 6 and 8 weeks, to be safe. If you do not wait the ammonia in the chemical dyes can turn your hair green.