Apply the rest of the color through the lengths and ends of your hair. Leave the hair color on for 25-30 minutes, depending on how many grays you have and your hair texture. Rinse your hair until the water runs clear.
Beside this, how long are you supposed to leave hair dye in your hair?
Timing. Timing is 30 minutes for standard color application; 45 minutes for maximum gray coverage and for high-lift shades. Typically, with permanent color, the first 15 minutes provide time for the peroxide and ammonia to open the cuticle and penetrate into the cortex to lighten natural pigment.
How long do you have to wait before you can dye your hair again?
How long should you wait before re-coloring your hair? It's generally suggested to wait at least four weeks between coloring hair. That's the minimum interval if you care about your hair but it would actually be better to wait somewhere around six or seven weeks if you're really scared of doing any damage.
How long can you keep semi permanent hair dye in your hair?
Let the dye set. How long you should leave it in for will vary by brand, but 30 minutes to an hour is typical. Unlike permanent dyes, which contain harsh chemicals that can damage your hair and skin, there is usually no "too long" with semi-permanent colors.