Stage 4 – Dark Blonde. Stages 3 and 4 can be confusing because light brown can look like dark blonde. But you can look at the hair’s undertones to determine the correct stage because dark blonde contains yellow pigments. When bleaching up to level 4, the red pigments are removed from the strands. If you take a few hair strands out of your hairbrush or comb and leave it in household bleach for 15 minutes, you’ll be to see the impact that Clorox will have on your hair. Likely, the bleach will significantly damage your hair. Why? Because human hair can’t handle the corrosive substances in household bleach, worse yet, if household How long to bleach level 7 hair? For blonde hair, use 20 Vol developer and aim for 15-20 minutes. How long does it take to lighten dark hair? It takes about 40-60 2. Wash your hair with purple shampoo. Follow the directions on your shampoo bottle. Apply the purple shampoo instead of normal shampoo, then rinse out and follow it with conditioner. Most purple shampoos need to be left in for 3-5 minutes for best results. 3. Repeat every two or three washes. So last year I made the appointment to go platinum. I sat through four hours of bleach processing and a quick trim to finish. When I walked out of the salon with a $260 bill and bright yellow hair It is usually used after bleaching to help remove any yellow tones from the hair and to help restore the natural color of the hair. Toner can also help to seal the cuticle of the hair and to help protect it from damage. If you are going to use a toner, it is important to choose the right one. There are many different types of toners available If you want to lift your hair 3-4 shades you would use a 20 or 30 volume developer. Depending on the shade, texture, and overall health of your natural hair before bleaching, the amount of time 20 volume developers should be left on the hair varies. 20 volume bleach should be left on the hair for no more than 30 minutes. Another option is to do a test strand before you bleach your entire head. This way, you can get an idea of how your mane handles bleach and how long it takes to lighten without experimenting on your whole head. Apply bleach to a few hidden strands from the underneath layer of your hair and time how long it takes to lighten. Photo Credit: Alanna Expert Insights. “The duration you leave bleach in your hair depends on several factors, including your hair type, its current color, and the desired end result. Typically, bleach is left in the hair for anywhere from 20 to 45 minutes.”. Muriel Perez, Certified Hair Restoration Specialist. Expert Insights. Those lucky girls, and honestly, these cases are rare, can bleach their hair once again after 7 to 10 days. This is only suitable for people who want to bleach one or two tones of hair. Why? Well, because the exposure time of the hydrogen peroxide, in this case, is much less. Never expose your hair to the bleach longer than forty-five minutes! O70zog.