The Best How Long Do I Leave T18 Toner In My Hair References. Web toner should be left on your hair for as long as possible without damaging your scalp or hair. Check your results here and there by wiping some of the toner off with a cotton ball or towel to see how things.

Web once you have achieved the desired color or your 30 minutes are up, rinse out the toner. Web this is a question that is often asked, and the answer can depend on a few factors. Web how long should you leave toner in bleached hair?