Caution: May over correct
Test product on an area that is not noticeable. Start with 3 minutes. If you notice no change re-apply and leave in for 2 additional minutes.
DO NOT LEAVE IN MORE THAN 10 MINUTES
If you notice grayish tint on end of the hair, this is the 1st sign of over correction. When this happens, immediately rinse out, and take 30 seconds up to minute off the leave-in time.