When it comes to bleaching hair, one of the most critical factors to consider is the development time. Leaving the bleach on for too long can cause damage, over-processing, and unwanted results, while not leaving it on for long enough may not achieve the desired level of lift. In this article, we will delve into the world of hair bleaching, focusing specifically on 40 volume bleach, and explore how long you should leave it on to achieve the perfect balance between lift and hair health.
Understanding Hair Bleach and Volume
Before we dive into the specifics of development time, it’s essential to understand the basics of hair bleach and volume. Hair bleach is a chemical treatment used to lighten hair by breaking down the pigment. The volume of bleach refers to the amount of developer used, which is usually measured in volumes (e.g., 10, 20, 30, or 40 volume). The volume of bleach determines how much lift you can achieve, with higher volumes resulting in more significant lightening. However, higher volumes also increase the risk of damage and over-processing.
The Role of 40 Volume Bleach
40 volume bleach is one of the most commonly used volumes in professional hair salons. It provides a significant amount of lift, typically 3-4 levels, making it ideal for achieving dramatic results. However, it’s crucial to use 40 volume bleach with caution, as it can be harsh on the hair, especially if left on for too long. It’s essential to follow the recommended development time to avoid damage and ensure the best possible results.
Factors Affecting Development Time
Several factors can affect the development time of 40 volume bleach, including:
Hair type and condition: Virgin hair, previously colored or damaged hair, and hair with a lot of porosity may require different development times.
Desired level of lift: The amount of lift you want to achieve will impact the development time. More significant lift requires longer development times.
Hair length and thickness: Longer or thicker hair may require longer development times to ensure even processing.
Determining the Optimal Development Time
So, how long should you leave 40 volume bleach on hair? The optimal development time will depend on the factors mentioned earlier. As a general guideline, the development time for 40 volume bleach can range from 20 to 45 minutes. However, it’s crucial to check the hair regularly to avoid over-processing.
Checking the Hair
To ensure the best possible results, it’s essential to check the hair regularly during the development time. You can do this by:
Wiping a small section of hair with a damp cloth to remove the bleach
Evaluating the color and condition of the hair
Adjusting the development time accordingly
Visual Inspection
A visual inspection is the most effective way to determine if the hair has reached the desired level of lift. Look for the following signs:
The hair has lightened to the desired shade
The hair feels soft and manageable
There are no signs of over-processing, such as dryness, brittleness, or breakage
Development Time Guidelines
While the optimal development time will vary depending on the individual, here are some general guidelines for 40 volume bleach:
For virgin hair, 20-30 minutes may be sufficient for 1-2 levels of lift
For previously colored or damaged hair, 30-40 minutes may be necessary for 1-2 levels of lift
For more significant lift (3-4 levels), 40-45 minutes may be required, but be cautious of over-processing
Post-Bleaching Care
After bleaching, it’s essential to provide the hair with proper care to minimize damage and ensure the best possible results. This includes:
Using a moisturizing shampoo and conditioner to hydrate the hair
Applying a hair mask or deep conditioning treatment to repair and nourish the hair
Avoiding heat styling tools or harsh chemicals for a few days after bleaching
Conclusion
Leaving 40 volume bleach on hair for the right amount of time is crucial to achieving the desired level of lift while minimizing damage. By understanding the factors that affect development time and following the guidelines outlined in this article, you can ensure the best possible results for your hair. Remember to check the hair regularly and adjust the development time accordingly. With proper care and attention, you can achieve the perfect balance between lift and hair health.
| Development Time | Lift | Hair Type |
|---|---|---|
| 20-30 minutes | 1-2 levels | Virgin hair |
| 30-40 minutes | 1-2 levels | Previously colored or damaged hair |
| 40-45 minutes | 3-4 levels | All hair types |
By following these guidelines and taking the necessary precautions, you can achieve the hair of your dreams with 40 volume bleach. Remember to always prioritize hair health and safety when using bleach or any other chemical treatments.
What is 40 volume bleach and how does it work?
40 volume bleach is a high-lift hair bleach that contains 12% hydrogen peroxide. It is commonly used by professionals and at-home users to achieve significant color changes, particularly when going from dark to light hair colors. The high volume of hydrogen peroxide in this bleach allows for a more dramatic lift, but it also increases the risk of damage to the hair if not used properly.
The hydrogen peroxide in 40 volume bleach works by breaking down the pigment in the hair shaft, allowing the hair to lift to a lighter color. However, this process can be damaging to the hair if it is left on for too long or if it is used on hair that has been previously damaged. It is essential to follow the instructions carefully and to perform a strand test before applying the bleach to the entire head to ensure the desired results and to minimize the risk of damage.
How long should I leave 40 volume bleach on my hair?
The recommended time for leaving 40 volume bleach on hair can vary depending on several factors, including the current color of the hair, the desired color, and the condition of the hair. Generally, it is recommended to leave 40 volume bleach on hair for 20-45 minutes, but this time may need to be adjusted based on the individual’s hair. It is crucial to check the hair frequently during the bleaching process to avoid over-processing, which can cause damage and breakage.
It is also important to note that leaving 40 volume bleach on hair for too long can cause it to become over-processed, leading to dryness, brittleness, and even breakage. On the other hand, not leaving it on long enough may result in insufficient lift, requiring additional bleaching sessions. To achieve the best results, it is recommended to consult a professional stylist or to follow the manufacturer’s instructions carefully. Additionally, performing a strand test before applying the bleach to the entire head can help determine the optimal processing time for the individual’s hair.
What factors affect the processing time of 40 volume bleach?
Several factors can affect the processing time of 40 volume bleach, including the current color of the hair, the desired color, the condition of the hair, and the temperature of the environment. For example, if the hair is currently very dark, it may require a longer processing time to achieve the desired lift. Similarly, if the hair is damaged or over-processed, it may require a shorter processing time to avoid further damage.
The temperature of the environment can also impact the processing time, as warmer temperatures can speed up the bleaching process. It is essential to consider these factors when determining the processing time for 40 volume bleach to ensure the best results and to minimize the risk of damage. A strand test can help identify the optimal processing time for the individual’s hair, taking into account these factors. By considering these factors and following the manufacturer’s instructions, users can achieve the desired results while minimizing the risk of damage to their hair.
Can I use 40 volume bleach on previously colored or damaged hair?
Using 40 volume bleach on previously colored or damaged hair can be more challenging and requires extra caution. Previously colored hair may have undergone significant chemical changes, which can affect the bleaching process. Damaged hair, on the other hand, may be more prone to further damage or breakage when exposed to high-lift bleach. It is essential to assess the condition of the hair before applying 40 volume bleach and to take necessary precautions to minimize the risk of damage.
If the hair is previously colored or damaged, it may be necessary to use a lower volume bleach or to perform a gentler bleaching treatment. Additionally, using a pre-bleach treatment or a hair mask can help to nourish and protect the hair before and after the bleaching process. It is also recommended to consult a professional stylist, especially if the hair is severely damaged or if the desired color change is significant. They can help determine the best course of action and provide guidance on how to achieve the desired results while minimizing the risk of damage.
How do I perform a strand test before using 40 volume bleach?
Performing a strand test before using 40 volume bleach is crucial to determine the optimal processing time and to ensure the desired results. To perform a strand test, select a small section of hair, preferably from the back or underside of the head, and apply the 40 volume bleach to the strand. Follow the manufacturer’s instructions for the recommended processing time, but check the strand frequently to avoid over-processing.
The strand test will help you determine how the bleach will affect your hair, including the lift, tone, and condition of the hair. It will also give you an idea of how long to leave the bleach on your hair to achieve the desired results. Based on the results of the strand test, you can adjust the processing time and make any necessary adjustments to the bleaching treatment. This step can help prevent damage, over-processing, and undesirable results, ensuring that you achieve the best possible outcome for your hair.
What are the risks associated with using 40 volume bleach?
Using 40 volume bleach can pose several risks, including damage to the hair, scalp irritation, and allergic reactions. The high volume of hydrogen peroxide in 40 volume bleach can cause the hair to become dry, brittle, and prone to breakage, especially if left on for too long or used on previously damaged hair. Additionally, the bleach can cause scalp irritation, including redness, itching, and burning, especially in individuals with sensitive skin.
To minimize the risks associated with using 40 volume bleach, it is essential to follow the manufacturer’s instructions carefully and to take necessary precautions. This includes performing a strand test, wearing protective gloves and eyewear, and avoiding contact with the scalp or skin. It is also recommended to use a conditioner or hair mask after the bleaching process to help nourish and moisturize the hair. If you experience any adverse reactions or discomfort during or after the bleaching process, it is crucial to seek medical attention or consult a professional stylist for advice.
How do I care for my hair after using 40 volume bleach?
After using 40 volume bleach, it is essential to care for your hair properly to minimize damage and promote healthy growth. This includes using a moisturizing conditioner or hair mask to help nourish and hydrate the hair. It is also recommended to avoid using heat styling tools or harsh chemicals for a few days after the bleaching process, as this can cause further damage to the hair.
Additionally, using a color-protecting shampoo and conditioner can help to maintain the color and vibrancy of the hair. Regular trims can also help to prevent split ends and breakage, promoting healthy growth and minimizing the appearance of damaged hair. By following a proper hair care routine and taking necessary precautions, you can help to maintain the health and integrity of your hair after using 40 volume bleach. It is also recommended to consult a professional stylist for personalized advice on how to care for your hair after the bleaching process.