>what's the ultimate benefit against just using hair dye?
Permanent hair color generally contains PPD to penetrate the hair cuticle so the dye can actually bind to the hair. That stuff is notorious for causing wicked allergic reactions and sensitizing users over time.
Permanent hair color generally contains PPD to penetrate the hair cuticle so the dye can actually bind to the hair. That stuff is notorious for causing wicked allergic reactions and sensitizing users over time.