Bleaching your hair can be a daunting task, especially when it comes to determining the right amount of time to leave the bleach in. Leaving it in for too long can cause damage, while not leaving it in long enough may not achieve the desired results. In this article, we will focus on 20 volume bleach and provide a detailed guide on how long to leave it in your hair.
Understanding Hair Bleach Volumes
Before we dive into the specifics of 20 volume bleach, it’s essential to understand the different volumes of hair bleach and their effects on the hair. Hair bleach comes in various volumes, ranging from 10 to 40. The volume of bleach refers to the amount of developer (hydrogen peroxide) in the bleach mixture.
Volume of Bleach and Lifting
The volume of bleach determines the amount of lift it will provide. The higher the volume, the more lift it will give. Here’s a general guideline on the lifting power of different bleach volumes:
- 10 volume: 1-2 levels of lift
- 20 volume: 2-3 levels of lift
- 30 volume: 3-4 levels of lift
- 40 volume: 4-5 levels of lift
20 Volume Bleach: What You Need to Know
20 volume bleach is a popular choice among hairstylists and at-home bleachers. It provides a moderate amount of lift, making it suitable for most hair types. However, it’s crucial to follow the instructions carefully to avoid over-processing or under-processing your hair.
Processing Time for 20 Volume Bleach
The processing time for 20 volume bleach depends on several factors, including your hair type, porosity, and the desired results. Here are some general guidelines for processing times:
- Virgin hair (hair that has never been colored or chemically treated): 20-30 minutes
- Colored hair (hair that has been previously colored or chemically treated): 30-40 minutes
- Damaged hair (hair that is brittle, dry, or over-processed): 15-25 minutes
Factors Affecting Processing Time
Several factors can affect the processing time of 20 volume bleach, including:
- Hair length and thickness: Longer and thicker hair may require longer processing times.
- Hair porosity: Hair with low porosity may require longer processing times, while hair with high porosity may require shorter processing times.
- Desired results: If you want to achieve a lighter shade, you may need to leave the bleach in for a longer period.
How to Determine the Right Processing Time for Your Hair
Determining the right processing time for your hair can be tricky. Here are some tips to help you get it right:
Perform a Strand Test
A strand test is a crucial step in determining the right processing time for your hair. It involves applying the bleach mixture to a small section of hair and processing it for a shorter period. This will give you an idea of how your hair will react to the bleach and help you determine the right processing time.
How to Perform a Strand Test
To perform a strand test, follow these steps:
- Choose a small section of hair, preferably from the back of your head.
- Mix the bleach and developer according to the instructions.
- Apply the bleach mixture to the strand of hair, making sure to saturate it evenly.
- Process the strand for 10-15 minutes.
- Rinse the strand thoroughly and evaluate the results.
Monitor the Processing Time
Once you’ve applied the bleach mixture to your hair, it’s essential to monitor the processing time closely. Check your hair every 5-10 minutes to see if it has reached the desired shade. If you’re unsure, it’s always better to err on the side of caution and rinse the bleach out sooner rather than later.
Risks of Over-Processing
Over-processing your hair with 20 volume bleach can cause damage, including:
- Dryness and brittleness
- Breakage and frizz
- Unwanted warm tones
- Over-lifting, leading to a brassy or yellowish color
How to Minimize the Risks of Over-Processing
To minimize the risks of over-processing, follow these tips:
- Always perform a strand test before applying the bleach mixture to your entire head.
- Monitor the processing time closely and rinse the bleach out as soon as you’ve achieved the desired results.
- Use a lower volume bleach if you’re unsure about the processing time or if you have damaged hair.
- Use a conditioning treatment after bleaching to help restore moisture and shine to your hair.
Conclusion
Leaving 20 volume bleach in your hair for the right amount of time is crucial to achieving the desired results without causing damage. By understanding the different volumes of hair bleach, performing a strand test, and monitoring the processing time closely, you can minimize the risks of over-processing and achieve the perfect shade. Remember to always follow the instructions carefully and take necessary precautions to protect your hair from damage.
| Volume of Bleach | Lifting Power | Processing Time |
|---|---|---|
| 10 volume | 1-2 levels of lift | 15-25 minutes |
| 20 volume | 2-3 levels of lift | 20-30 minutes |
| 30 volume | 3-4 levels of lift | 25-35 minutes |
| 40 volume | 4-5 levels of lift | 30-40 minutes |
By following these guidelines and taking the necessary precautions, you can achieve the perfect shade with 20 volume bleach and maintain healthy, beautiful hair.
What is 20 volume bleach, and how does it work?
20 volume bleach is a type of hair bleach that contains 20 volume developer, which is a mixture of hydrogen peroxide and ammonia. The developer helps to open up the hair cuticle, allowing the bleach to penetrate and break down the pigment. The result is lighter, more vibrant hair. 20 volume bleach is considered a relatively strong bleach, but it’s still gentle enough for most hair types.
When you apply 20 volume bleach to your hair, it starts to work immediately. The developer helps to break down the pigment, while the bleach lifts the color. The longer you leave the bleach on, the lighter your hair will become. However, it’s essential to follow the instructions carefully and not leave the bleach on for too long, as this can cause damage and over-processing.
How long should I leave 20 volume bleach in my hair?
The length of time you should leave 20 volume bleach in your hair depends on several factors, including your hair type, the desired results, and the condition of your hair. Generally, it’s recommended to leave 20 volume bleach on for 20-45 minutes. However, if you’re looking for a more subtle lift, you may want to leave it on for 10-20 minutes. If you’re looking for a more dramatic lift, you may want to leave it on for 30-45 minutes.
It’s essential to keep an eye on the processing time and check your hair regularly to avoid over-processing. You can do this by performing a strand test before applying the bleach to your entire head. This will give you an idea of how long it takes for the bleach to achieve the desired results. Remember, it’s always better to err on the side of caution and start with a shorter processing time, as you can always reapply the bleach if needed.
What happens if I leave 20 volume bleach in my hair for too long?
If you leave 20 volume bleach in your hair for too long, it can cause damage and over-processing. This can lead to dry, brittle hair that’s prone to breakage. Over-processing can also cause the hair to become porous, leading to frizz and unmanageability. In severe cases, leaving bleach on for too long can even cause the hair to break off or become discolored.
To avoid over-processing, it’s essential to follow the instructions carefully and keep an eye on the processing time. If you’re unsure about how long to leave the bleach on, it’s always better to err on the side of caution and start with a shorter processing time. You can always reapply the bleach if needed, but you can’t undo damage that’s already been done.
Can I use 20 volume bleach on my entire head, or should I do a strand test first?
It’s highly recommended to do a strand test before applying 20 volume bleach to your entire head. A strand test will give you an idea of how the bleach will affect your hair and help you determine the right processing time. This is especially important if you’re new to bleaching your hair or if you’re unsure about how your hair will react.
To do a strand test, simply apply the bleach to a small section of hair and process it for the recommended time. Then, rinse the bleach out and evaluate the results. This will give you an idea of how the bleach will affect your hair and help you avoid any potential damage or over-processing.
How often can I use 20 volume bleach on my hair?
It’s generally recommended to wait at least 4-6 weeks before reapplying 20 volume bleach to your hair. This allows your hair time to recover from the previous bleaching process and reduces the risk of damage and over-processing. However, the frequency of use will depend on your hair type and the condition of your hair.
If you have damaged or over-processed hair, it’s best to wait longer before reapplying the bleach. On the other hand, if you have healthy hair and are looking to maintain a light color, you may be able to get away with reapplying the bleach more frequently. However, it’s always best to err on the side of caution and wait as long as possible before reapplying the bleach.
Can I use 20 volume bleach on colored or chemically treated hair?
It’s generally not recommended to use 20 volume bleach on colored or chemically treated hair. Bleach can react with the color or chemicals in your hair, causing damage, over-processing, or unpredictable results. If you have colored or chemically treated hair, it’s best to wait until the color or chemicals have faded before applying the bleach.
However, if you still want to use 20 volume bleach on colored or chemically treated hair, it’s essential to do a strand test first. This will give you an idea of how the bleach will affect your hair and help you avoid any potential damage or over-processing. It’s also recommended to consult with a professional stylist before applying bleach to colored or chemically treated hair.
What are some tips for minimizing damage when using 20 volume bleach?
To minimize damage when using 20 volume bleach, it’s essential to follow the instructions carefully and take good care of your hair before and after the bleaching process. This includes using a pre-bleach treatment to open up the hair cuticle, applying a conditioning treatment after the bleach, and using a sulfate-free shampoo and conditioner to maintain moisture and hydration.
It’s also recommended to use a lower volume developer if you have damaged or over-processed hair. This will help to minimize damage and reduce the risk of over-processing. Additionally, be sure to perform a strand test before applying the bleach to your entire head, and avoid using heat styling tools or other harsh chemicals on your hair after the bleaching process.