Choosing Developer Strength for Root Touch-ups
The chemistry of hair colour relies on the interaction between a base colour and a developer. The developer, measured in volumes, acts as the catalyst that opens the hair cuticle to deposit pigment or lift natural melanin.
Selecting the incorrect strength leads to uneven tone or insufficient coverage of root regrowth. Understanding the distinction between 10, 20, and 30 volume allows you to match your application to your specific hair needs without compromising structural integrity.
- Difficulty
- Beginner
- Total time
- 45 minutes
- Cost
- Low to moderate
- Cadence
- Every 4-6 weeks
Ingredients
- Hydrogen Peroxide: The active oxidising agent in developer
- Ammonia: Often present in permanent colour to assist cuticle swelling
Tools List
- Non-metallic tint bowl
- Synthetic bristle tint brush
- Sectioning clips
- Digital kitchen scale
Step by step
Partition the hair
Divide hair into four clean quadrants using a tail comb. Ensure the parting is straight, as precision is necessary when applying colour only to the regrowth to prevent overlapping on previously coloured ends.
Tip: Use hair clips to secure sections.Combine developer and colour
Measure the ratio according to the specific manufacturer instructions provided on your colour packaging. Pour the developer into a non-metallic bowl before adding the colour cream to ensure an accurate, lump-free mixture.
Tip: Use a digital scale for accuracy.Apply to roots only
Using the brush, apply the mixture strictly to the regrowth area. Start at the front hairline, moving systematically toward the back, ensuring each section is saturated without bleeding onto the mid-lengths.
Tip: Apply to the most grey-resistant areas first.Allow the colour to develop
Set a timer based on the manufacturer requirements. Stay in a room with a consistent temperature to ensure even processing. Do not cover the hair with plastic caps unless specifically instructed, as this can trap heat and accelerate the process unpredictably.
Tip: Check one small section after 20 minutes.Rinse and emulsify
Rinse the roots thoroughly with lukewarm water until the runoff is clear. Emulsify the product along the scalp line to loosen any remaining pigment before shampooing twice with a colour-safe formula.
Tip: Rinse until the water runs completely clear.
Trouble
What is the primary role of 20 volume?
20 volume is the standard strength for depositing colour and providing standard coverage for grey hair. It provides moderate lift while ensuring pigment anchors into the shaft.
When is 10 volume appropriate?
10 volume is used when no lift is required, typically for darkening hair or refreshing faded lengths. It lacks the strength to cover resistant grey hair effectively.
Is 30 volume ever necessary for roots?
30 volume is intended for high-lift applications where you need to lighten the natural hair significantly. It is rarely required for standard root touch-ups unless specifically trying to achieve a lighter level than your base.
Can I mix volumes to get a custom strength?
While mathematically possible, it is not recommended for home users. Consistency is key to a repeatable result; stick to the volume recommended by your specific colour system.
Developer volume is the variable that determines whether your hair colour deposits or lifts.
Precision in mixing is more vital than the brand of the product itself.
More: root touch-up, tinting hair darker at home and colour and treatment.