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How Long to Leave Bleach in Your Hair: A Comprehensive Guide

Many people want to lighten their hair at home to avoid expensive salon visits. Bleaching is a process that strips the hair of its natural color to make it lighter, but it's not a one-size-fits-all process and should be approached with caution. This guide provides advice on how to bleach your hair at home, including how long to leave the bleach on and how to minimize damage.

Understanding the Bleaching Process

Bleach is an aggressive chemical that works by opening the hair cuticle and dissolving the color (melanin). The two most common types of bleaches use ammonia and hydrogen peroxide. The longer the bleach stays on your hair, the more protein bonds (keratin) are destroyed, which can lead to significant damage.

Nikki Goddard, a certified hairstylist and makeup artist, warns against products labeled "peroxide-free," as they often contain other oxidizing agents that may be even more harmful.

Factors Affecting Bleach Processing Time

How long you leave bleach in your hair depends on several factors:

  • Original hair color: Darker hair requires longer processing times.
  • Desired hair color: Achieving a lighter shade requires more time.
  • Hair texture: Fine hair processes faster than coarse hair.
  • Previous hair treatments: Relaxed, straightened, or chemically treated hair is more susceptible to damage.
  • Developer volume: Lower volumes require longer processing times, while higher volumes work faster.
  • Whether your hair has been previously colored

The maximum amount of time you should leave bleach on your hair is 30 minutes. Leaving it on longer than that can cause brittle strands and other serious damage.

Read also: Long Hair and Scalp Health

Potential Dangers of Bleaching

Besides leaving bleach on for too long, there are other risks associated with bleaching:

  • Loss of Pigment: The oxidation process can cause the hair to lose all pigment and turn white.
  • Weak and Porous Hair: Bleach can weaken the hair and make it highly porous, meaning the hair cuticles are too widely spaced, making it difficult for the strands to retain moisture. According to Goddard, excessive porosity and dehydration can lead to the destruction of the hair shaft and irreversible damage.
  • Keratin Loss: Bleaching can lead to the loss of keratin, a protein that makes up the hair. Without keratin, the hair becomes brittle and difficult to style.

Important Precautions Before Bleaching

Before attempting to bleach your hair at home, consider these essential precautions:

  1. Complete a Patch Test: Perform a patch test before applying bleach to your entire head to check for allergies or excessive damage. According to Kerry E. Yates, founder of Colour Collective and a trichologist in training, if the hair ends kink up, look frizzy, or frayed, do not lighten your hair.

  2. Read the Directions Carefully: Always follow the product directions carefully and wear gloves and protective eyewear. Vincent De Marco, hairstylist and owner of Vincent Hair Artistry, recommends taking professional steps, such as wearing gloves and protective eyewear. Check the hair's lightness level every 5 to 10 minutes, starting after 10 minutes, but never leave the bleach on for longer than 1 hour. If the desired results aren’t achieved after 30 minutes, rinse it out, mix a fresh batch, and reapply.

  3. Consider Your Hair Type: If you have relaxed, straightened, or chemically treated hair, avoid bleaching, as it can cause the hair to turn to dust. While bleach can be used on curly hair, be very gentle during application.

    Read also: Brazilian Wax Guide

Step-by-Step Guide to Bleaching Hair at Home

  1. Preparation: Gather all necessary products, including a hair bleach kit, plastic bowl, application brush, latex gloves, old towels, and an old shirt. Work in a well-lit and well-ventilated area.
  2. Choose the Right Bleach Kit: For darker hair, consider using L’Oréal Paris Feria Hyper Platinum Advanced Lightening System Bleach, which can lighten hair up to eight levels in a single application. For dark blonde, light brown, and medium brown hair, L’Oréal Paris Colorista Hair Bleach & Lightener At Home Kit is a good option.
  3. Mix the Bleach: Follow the instructions on your chosen hair bleach kit to combine the lightener and developer in a bowl.
  4. Section Your Hair: Divide your dry, unwashed hair into four manageable sections using hair clips.
  5. Apply the Bleach: Apply the bleach mixture evenly over each section of hair, starting about one inch down from your roots. Roots process faster due to body heat.
  6. Processing Time: Knowing how long to leave bleach in your hair is important, as overprocessing can result in extensive damage. However, processing time isn’t one-size-fits-all: some formulas may work faster (or slower) than others.
  7. Rinse and Condition: After the appropriate processing time, slip on your protective gloves and thoroughly shampoo your hair with lukewarm water to remove every last trace of bleach. Most kits come with an extra nourishing conditioner, but you can also reach for a product like the L’Oréal Paris EverPure Sulfate-Free Bond Strengthening Conditioner.
  8. Tone Your Hair: Use a hair gloss or color-correcting toner to neutralize unwanted brassy tones. L’Oréal Paris Feria Power Demi-Permanent Anti Brass Toner in Pearl Blonde or Ice Blonde are good options.
  9. Apply Hair Color (Optional): If you want to dye your hair a different color, now is the time to apply a temporary, semi-, or demi-permanent dye.

Post-Bleach Hair Care

Follow these tips to restore your hair’s health and softness after bleaching:

  • Use pre-shampoo conditioners 3 days before and after bleaching.
  • Do a post-color treatment, such as Olaplex.
  • Apply a nourishing hair mask.
  • Apply a thermal protector when styling hair with an iron or a blow dryer.
  • Wear a lightweight protective spray or serum daily.
  • Use a hair conditioner after shampooing.
  • Brush the hair gently without pulling too hard.
  • Wash hair with lukewarm water to prevent drying out.
  • Use a reconstructing product.
  • Wait 6 to 8 weeks before bleaching again.

Bleaching at Home vs. Going to a Salon

Pros of Going to a Professional Salon

  • Expertise: Professionals are familiar with the bleaching process and can guarantee full coverage. If you go it alone, you might end up with blotchy spots and a color that you don’t like.
  • After-Color Treatments: Salons offer after-color treatments to prevent damage. These treatments provide a strong burst of moisture and nourishment. A common post-hair treatment used by hairstylists is Olaplex, which ensures that the hair can’t overbleach to the point of breakage.

Pros of Bleaching Your Hair at Home

  • Cost-Effective: Bleaching at the salon can cost anywhere from $150 to $200, whereas doing it at home is much cheaper.

Cons of Bleaching Your Hair at Home

  • Handling Intense Chemicals: Bleach is an abrasive chemical that needs to be handled correctly. According to Yates, bleach has an incredibly high pH, which can literally blow up the hair if used incorrectly.
  • Lack of Expertise: You may not know what’s normal and what’s not when it comes to processing. Professionals check on your hair to make sure that it’s processing well and are aware of what’s normal and what’s not.

Expert Advice on Bleaching Hair

Sarah Conner, a master hair colorist and celebrity stylist, emphasizes that bleaching is a chemical service, not a conditioning treatment. She advises that seeking a skilled professional is best for on-scalp lightening applications, as it can be risky. However, it’s possible to do it at home if you follow step-by-step instructions and consider your hair’s condition at every stage.

Essential Tools and Products

Before starting, gather the following:

  • Bleach (Lightener): Redken Flash Lift (powder) or Framesi Decolor B Cream Plus (cream).
  • Developer: Salon Care developers (volume depends on hair condition).
  • Gloves: Salon Care Black Nitrile Gloves.
  • Barrier Cream: Aquaphor Healing Ointment or Schwarzkopf Professional Skin Protect Barrier Cream.
  • Mixing Bowl & Brush: Magic Collection Mixing Bowl and Dye Brush.
  • Whisk: For blending bleach and developer.
  • Heat Source: BaBylissPRO Nano Titanium 2000-Watt Blow Dryer.
  • Proper Shampoo & Conditioner: Salon-grade, hydrating, or reparative formulas (Milbon, Virtue Labs, and Davines).
  • Purple Shampoo: Shimmer Lights or DpHue Cool Blonde Shampoo.
  • Coconut Oil or Bond-Building Treatment: Olaplex No. 0 Intensive Bond Building Hair Treatment or OGX Nourishing + Coconut Oil Weightless Hydrating Oil Hair Mist.
  • Shower Cap or Plastic Wrap: Salon Care Professional Processing Caps.
  • Toner: Redken Shades EQ or Wella Professionals Lightest Ash Blonde Permanent Liquid Toner.

Preparing Your Hair

  1. Don't Wash Hair: Natural oils protect the scalp.
  2. Apply Coconut Oil: Helps prevent excess dryness.
  3. Olaplex Treatment: Strengthens hair.
  4. Strand Test: Determines how long your hair takes to lift and which developer volume is best.
  5. Skip Harsh Skincare Products: Avoid retinol a few days before bleaching.

Mixing and Applying the Bleach

Follow the brand’s specific instructions for mixing the bleach. The lighter your natural hair color, the lower the developer volume you’ll need; the darker your hair, the higher the developer required.

For long hair, start with the mid-lengths of the hair first, away from the scalp and ends. After that, go back and apply it to the roots and ends. Cover the hair with a plastic processing cap or wrap to lock in heat and prevent the bleach from drying out.

Read also: Detecting Alcohol Use via Hair Analysis

Processing Time and Checking the Lift

Processing time varies depending on hair color and developer volume. Check your hair every 15-20 minutes. Lift to a pale yellow (melted butter) for a safe choice. Toning will be the next step if you prefer a cooler, lighter blonde.

Toning and Neutralizing Brassiness

Rinse thoroughly with warm (not hot) water and apply toner. A cool-toned or silvery toner will help eliminate any remaining yellow hues.

Final Wash and Post-Bleach Hair Care

Rinse your hair and proceed with shampooing and conditioning using hydrating, color-safe products. Use lightweight leave-in conditioners and hair oils daily to help maintain moisture and prevent brittleness. Minimize heat styling and use a heat protectant when necessary.

Maintaining the Look

Touch up bleached roots every 4-6 weeks. Use purple shampoo once or twice weekly to keep brassiness at bay.

Common Mistakes to Avoid

  • Not doing a strand test.
  • Forgetting to tone.
  • Not lifting the hair enough.
  • Using excessive heat styling.

General Hair Bleaching Questions

What is Hair Bleaching?

When you bleach hair, you strip out the color pigments from the hair cortex, making the hair lighter.

How Does Hair Bleach Work?

Hair bleaches contain persulfates. When combined with an oxidizing agent such as hydrogen peroxide, the cuticle of the hair gets opened up. The chemical then enters the cortex and lightens out the melanin, or pigments.

Is Hair Bleaching the Same as Hair Coloring?

Both bleach and oxidizing color penetrate the hair cortex and lift the melanin out. However, bleach can lift the hair by as much as 8-9 levels, while hair color typically lifts by a couple of levels at most. Additionally, hair color re-colors the melanin, while bleach only makes it lighter.

Is Bleaching Harmful to the Hair?

Bleaching is a fairly aggressive process, but providing the hair is healthy and you use quality ingredients and the right techniques, you should be able to achieve a quality result.

Is Bleaching Harmful to the Scalp?

The chemicals are fairly strong, and most women feel a slight discomfort when it is applied on the scalp. Using a quality bleach will limit the itchy sensation and protect the scalp.

How Long Does It Take to Bleach Hair?

On medium-length hair, the application process should take between 10 and 20 minutes. The processing time after that can be around 30 minutes. Re-application of bleach, if necessary, and a second round of processing can add another 30 minutes.

How Long Does Bleached Hair Last?

Once you bleach hair, it is bleached permanently, unless you recolor or retone.

Should You Bleach Hair Several Times or Just One Time?

We would recommend that you bleach hair once only and do it right, so that it is lifted all the way to where it needs to be, and avoid repeated bleach applications.

Can I Use a High Lift Color Instead of Bleach?

High lift color can lift hair around 3-5 levels if you use it with 30 Vol developer, but bleach will give you a better lift with more melanin or color taken out.

Can I Just Tone the Hair Instead of Bleaching It?

For those wanting to get their hair platinum blonde, we recommend that you bleach the hair first all the way to level 10, then tone.

Preparations for Bleaching

What Supplies Do I Need to Bleach Hair?

Bleach, developer, rubber gloves, some plastic clips, a plastic coloring bowl, and a dye brush are the basics. You will also need a toner for use after bleaching, as well as purple shampoo or mask, and some post-bleaching hair treatment products.

Should I Wash My Hair Before Bleaching?

No, you should not do that. It is perfectly OK to apply bleach on dry dirty hair, even if that hair has product on it. The best preparation for bleaching hair is to leave it unwashed for a few days prior to bleaching it.

How Do I Test if My Hair is Healthy Enough for Bleaching?

Wet the hair, then take one strand and pull it apart. If it stretches a little, that means it has its natural elasticity, which means it is healthy enough to bleach.

Which Bleach Do I Need for Very Dark and Ultra Dark Hair?

Brilliant Blonde 8 level lifting bleach has been specially designed for lifting dark hair.

Which Bleach Do I Need for Fragile and Thin Hair?

Brilliant Blondexx is a 7 level lifting bleach with Bond Protect. It can be used on-scalp and on fragile hair.

Which Bleach Do I Need for On-Scalp Bleaching?

Brilliant Blondexx with Bond Protect. The Bond Protect and the very creamy, oily mix will protect the scalp during the bleaching process.

Which Bleach Do I Need for Hair That Has Been Colored or Toned Darker?

Brilliant Blonde. Be prepared to do a couple of applications, once with 30 vol, then rinse, then again with 20 Vol.

Which Developer Strength Do I Need for Bleaching?

20 and 30 Vol developer are the 2 strengths most commonly used.

Which Toners Do I Need for After Bleaching?

It depends on how well you bleach the hair. If you bleach it all the way to a consistent ultra-pale yellow (level 10), then you can use ammonia-free toners.

What Hair Care or Hair Treatment Products Do I Need?

Purple shampoo and mask will help keep yellow away. A Bond Protect hair treatment can help strengthen the hair after bleaching.

The Bleaching Process

Which Developer Strength Should I Use?

For lifts of up to 3 levels, and for the root area, use 20 Vol. For lifts greater than 3 levels, use 40 Vol. For second applications of bleach, always use 20 Vol.

Which Bleach Mix Should I Use?

1 part bleach to 2 parts developer will give you the right mix - not too runny, not too thick.

How Should I Mix the Bleach?

Mix in a plastic bowl using a plastic whisk or dye brush. Make sure that the mix is completely smooth and homogenous, with no bits.

How Do I Apply the Bleach to the Hair for Root Applications?

For root and regrowth applications, apply just on the regrowth area and wait for it to lift.

How Do I Do a Full Head Application of Bleach?

For full head applications, section the hair into 4 large sections. Pin these sections up with plastic clips. Then open up a section at the back and start your bleaching application there, segmenting finely. Then open up the other sections and work your way around.

How Do I Bleach Highlights?

Take strands of hair and bleach them with a dye brush. You can use foil to keep these strands separate from the hair which you don't want to bleach.

How Do I Use Foil When Bleaching?

Bleaching using foil is a great idea when the hair is very dark and you have a lot of lifting to do. Using foil keeps the heat in and allows for faster processing speed when bleaching.

How Much Bleach Should I Use?

The rule is to apply as much product as possible. Literally whack it on. No tentative pokes when applying bleach. Your hair needs to get fully saturated with the bleach mixture.

How Long Should I Leave Bleach On My Hair?

Check the bleach 10-15 minutes after it starts processing to how well it is lifting. Your aim is level 10 which is a very, very pale yellow. If after 15 minutes it is bright orange or orange-yellow, the chances are it is not going to get to level 10 in 40 minutes. So at this stage you need to make fresh bleach mix (use 20 Vol) and re-apply to those parts which are really orange and brassy.

How Many Levels Can I Lift My Hair in One Bleaching Session?

You can bleach your hair all the way from dark to blonde provided you use quality products and you do it right. Use 30 Vol the first time and then 20 Vol for second applications.

Bleach - When & How to Rinse

How Long Do I Leave the Bleach to Process?

After applying bleach, wait 10 minutes, then check one part of the hair to see how fast it is lifting. Wait until the hair gets to a very very pale yellow, then rinse.

How Do I Know When to Rinse?

Rinse when the hair is at level 10 - very very pale yellow.

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