6% hydrogen peroxide is equivalent to how many volume (vol)?

6% hydrogen peroxide is equivalent to how many volume (vol)?

• A. 20 vol
• B. 10 vol
• C. 30 vol
• D. 40 vol

Answer: (A)

Volume measures how much oxygen the developer releases to lift the hair. A common reference ties specific percentages to volumes: 3% corresponds to 10 volume, 6% to 20 volume, 9% to 30 volume, and 12% to 40 volume. Since 6% hydrogen peroxide matches 20 volume, that is the correct equivalence. Higher volumes lift more but can be harsher, while lower volumes lift less. The other options align with different percentages (3% → 10 vol, 9% → 30 vol, 12% → 40 vol), so they don’t match 6% peroxide.

Volume measures how much oxygen the developer releases to lift the hair. A common reference ties specific percentages to volumes: 3% corresponds to 10 volume, 6% to 20 volume, 9% to 30 volume, and 12% to 40 volume. Since 6% hydrogen peroxide matches 20 volume, that is the correct equivalence. Higher volumes lift more but can be harsher, while lower volumes lift less. The other options align with different percentages (3% → 10 vol, 9% → 30 vol, 12% → 40 vol), so they don’t match 6% peroxide.