Dyeing your hair with box dye is common because it is easy and convenient. It is also often cheaper than going to a salon. With practice, you can get great results with box dye.
But if you dye your hair often, you may want to bleach it later. That is when people ask, “Can I bleach box-dyed hair?”
Generally you can bleach over box dyed hair, but expect the reult to be uneven and brassy. Do not bleach your hair if you dyed your hair with black henna, progressive or gradual haircolor, metallic dyes. These dyes contain metallic salts which react with bleach and cause fire.
Bleaching over box dye can be a gamble. Results can look uneven, especially if you dyed over old colors more than once.
It is also hard to go from dark to light in one session. If you expect to go from black box dye to platinum blonde in one day, the result will likely disappoint you.
For very dark hair, it often takes more than one session, spread over weeks or months.
How To Bleach Box Dyed Hair Safely
Bleaching can go wrong fast. Even if you have done it at home before, box dye layers can make the process harder to predict.
If you have layered multiple colors, expect slower lift and more uneven tones.
Warning
Some progressive dyes (often marketed as gradual color or color restorers) and some natural dyes contain metallic salts
If metallic salts are in your hair, bleach or peroxide in developer can trigger a fast heat reaction. Hair can smoke, melt, and break off.
What to do
- Check the ingredients list of what you used. If it mentions metallic salts, lead acetate, silver, copper, or “progressive” color, do not bleach.
- If you used henna or a “herbal” dye and you are not 100 percent sure what was in it, treat it as high risk.
- Do a strand test and watch for heat, fizzing, smoke, or a strong hot feeling. If any happens, rinse right away and do not continue.
Evaluate Your Hair’s Health
Before bleaching your hair, decide if it is healthy enough to handle bleach.
If your hair is damaged, focus on repair first. You can keep it simple with healthy oils, or use hair masks. Coconut oil or jojoba oil are good choices for basic care.
Even if your hair seems healthy, doing a few treatments before bleaching can help.
Signs of poor hair health include easy breakage, shedding, and damage from past bleach, dye, or heat without heat protection.
Split ends are another sign. Look at your ends. Feel your strands. Healthy hair feels smoother and detangles more easily.
Make a Plan
This is a good time to consult a hairstylist, if you can. They can tell you what lift is realistic and how many sessions you may need.
Stylists can also do a test strand to see how your hair reacts. If you do not want a consultation, you can do your own test strand at home.
How To Do a Test Strand
Pick a small section of hair in a hidden spot. Apply bleach to that section and leave it on for the time listed on your bleach instructions.
Rinse with cool water and check the strand. Breakage can show right away. Let it air dry and feel the texture.
If it feels fried or crispy, your hair is not ready. Do hair treatments and try again in a few months.
If your hair feels strong enough, look at the color result. That tells you how much lift you can expect in one session.
If the strand reaches your target shade, you may only need one bleach session. If it does not, plan for multiple sessions with recovery time in between.
Plan your aftercare now too. If you need a second round, you may need to wait up to six weeks between sessions.
Bleach Your Hair
When you bleach over box dye, aim for control, not speed. Box dyed hair often lifts unevenly, and it can turn patchy or splotchy if you rush.
Use small sections. Saturate the hair fully. Work with a timer.
- Section your hair into four parts. Clip each part.
- Start on mid lengths and ends first. Do not start on the roots.
- Reason: your scalp heat makes roots lift faster. This can cause “hot roots” where roots go bright yellow while lengths stay darker.
- Apply bleach to the darkest dyed areas first. Usually this is the mid lengths and ends.
- After about 15 to 20 minutes, apply bleach to the roots for the final processing time.
- Check every 5 to 10 minutes. Stop as soon as you reach the lift your hair can handle.
- Rinse well. Shampoo. Then use a deep conditioner.
My Advice: Developer Strength
Avoid the default 40 volume developer found in many kits. On box dyed hair, it can cause severe breakage.
A lower strength is safer. 20 volume is a common safer choice for previously dyed hair. 30 volume can be risky and is easier to over process.
Some colors are harder to remove, especially black, red, and blue. Even with careful work, you may still see leftover patches after one session.
Can I Bleach Permanent and Semi-Permanent Box Dyed Hair?
Semi-permanent box dye often fades over time. If you can wait, you may not need bleach. After enough washes, you can usually dye over it.
Permanent box dye is more stubborn. You can bleach it, but bleach should not be your first step.
Stylist Tips
Start with a sulfur based color remover. It targets the artificial dye molecules so they can wash out. It does not work like bleach and it is usually less damaging to the hair’s structure.
If a remover lifts enough dye, you may need less bleach later. If you still need bleach, your hair will often handle it better because you removed dye first.
Do not use a remover or bleach if you suspect metallic salts. See the warning above.
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