How to Choose the Right Hair Lightening Kit Volume
By Hunt Or Dye Home For Contact Lenses & Hair Dye | Published: 2026-10-28
Category: Buying Guides
Understand the difference between 30 vol and 40 vol bleach kits, and learn which developer volume suits your hair type and desired lift.
Quick Answer
Choose a 30 vol kit for standard at-home lightening with less damage, or a 40 vol kit when you need maximum lift in one session—but only if your hair is healthy and you accept higher risk.
Volume Numbers Explained
The volume number on a hair lightening kit refers to the concentration of hydrogen peroxide in the developer. Higher volume means stronger bleaching action, faster lift, and more potential damage. Understanding this trade-off is key to choosing the right kit.
Lift vs. Damage
30 vol developer typically lifts hair up to 2-3 levels, making it a safer choice for at-home use. 40 vol can lift 4 or more levels but is harsher on the hair shaft. If your hair is fine, damaged, or previously colored, a lower volume is a wiser choice.
When to Choose 40 Vol
40 vol is best when you need dramatic lightening in one session, such as going from dark brown to blonde. It's also useful for resistant hair that doesn't lift easily with lower volumes. However, it requires careful application and monitoring to minimize breakage.
Decision Rules for Choosing Volume
- If your hair is healthy and you need more than 3 levels of lift: Choose a 40 vol kit. It will lift faster and more dramatically, but be prepared for potential dryness and damage. Do a strand test first to gauge the result and condition of your hair.
- If your hair is fine, damaged, or you're new to bleaching: Choose a 30 vol kit. It lifts more gently and reduces the risk of breakage, even if it may take longer to achieve your desired shade. Consider a second session a few weeks later if you need more lift, rather than using a higher volume.
- If you have resistant or coarse hair: A 40 vol kit may be necessary to achieve the lift you want. Apply carefully and avoid overlapping on previously processed areas. Always follow the manufacturer's instructions and never exceed the recommended processing time.
Product Facts
- Directions - Hair Lighteneing Kit 40 vol.: Directions Hair Lightening Kit 40 vol is part of a range from La Riché Ltd, a company established since 1981 with worldwide distribution. This kit offers maximum lift for dramatic color changes, but its strength means you should only use it on healthy hair and follow instructions precisely.
Directions - Hair Lighteneing Kit 40 vol. - Directions - Hair Lighteneing Kit 30 vol: Directions Hair Lightening Kit 30 vol is also from La Riché Ltd, a brand with decades of experience in hair products. This kit provides a gentler lightening option that is more forgiving for at-home use, making it a reliable choice for most hair types.
Directions - Hair Lighteneing Kit 30 vol
Who Should Choose Which Volume
Best for
- 30 vol: People with normal to fine hair who want a safe, gradual lightening effect.
- 40 vol: Those with healthy, thick hair who need maximum lift in one session for a dramatic change.
Not for
- 40 vol: Not for damaged, over-processed, or very fine hair, as it can cause severe breakage.
