Here's why:
* Peroxide and Hair Color: Peroxide is a developer that is mixed with hair dye. Its primary job is to:
* Open the hair cuticle, allowing the dye to penetrate.
* Lighten the natural hair pigment.
* Volume and Strength: The "volume" of peroxide refers to its strength. A higher volume means a stronger concentration of hydrogen peroxide.
* Lifting Power: 20 volume peroxide has a higher lifting power than 10 volume peroxide. This means it can lighten the natural hair pigment more effectively, resulting in a lighter overall color.
* 10 Volume: Usually used for depositing color or achieving minimal lift. It's gentler on the hair.
* 20 Volume: Provides more lift and is commonly used for covering gray hair, lifting 1-2 levels, and achieving a more noticeable color change.
* Higher Volumes (30, 40): Offer even more lift but also cause more damage to the hair.
Important Considerations:
* Hair Health: Using a stronger peroxide can be more damaging to the hair. It's important to choose the lowest volume that will achieve the desired result to minimize damage.
* Desired Result: The amount of lift needed depends on the desired color change. If you're only going a shade or two lighter, 10 volume might be sufficient. For a more drastic change, 20 volume or higher might be necessary.
* Consult a Professional: If you're unsure which volume of peroxide to use, it's always best to consult a professional hairstylist. They can assess your hair's condition and recommend the best option for achieving your desired color without causing unnecessary damage.
In Summary:
20 volume peroxide is stronger and will lift hair color more than 10 volume peroxide. Always consider the health of your hair and the desired result when choosing the appropriate volume.