Evesel Oxidizer Hair
EVESEL's hair oxidizer range supplies the developer component for at-home and professional hair coloring. The collection includes 6% and higher-concentration oxidizers in multiple sizes - from a 150g decolorizer-format bottle for single-use lightening to 800ml professional-scale bottles for salons or regular home users. Oxidizers are sold separately from EVESEL hair dye so you can match the developer strength and volume to your specific color service.
By Skinsli editorial Updated
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Buying guide
EVESEL Hair Oxidizer Guide - Choosing Strength and Volume
Hair oxidizers (also called developers or peroxide cream) are the chemical activating component in permanent and demi-permanent hair color. The dye pigments are inert until they are mixed with an oxidizer - the chemical reaction opens the hair cuticle and deposits or lifts color. EVESEL supplies oxidizers separately from its hair dye line, which gives you control over the developer-to-dye ratio and the oxidizer concentration for different coloring services. This guide explains what the numbers mean, how to choose between the available sizes, and what to watch out for when handling peroxide-based products.
What a Hair Oxidizer Is and What It Does
A hair oxidizer is a hydrogen peroxide cream (or liquid) used to activate permanent and semi-permanent hair color. When mixed with hair dye, the peroxide molecules react with the melanin in the hair shaft and with the dye precursors simultaneously - opening the cuticle to allow dye entry and oxidizing the color molecules inside the cortex to their final colored form.
The concentration of hydrogen peroxide, expressed as a percentage (3%, 6%, 9%, 12%), determines how much lift the developer provides. Higher percentages remove more of the hair's natural pigment before depositing the new color, which is why they are needed for significant lightening or when coloring dark hair to a lighter shade.
6% (20 Vol) Developer - Most Common Residential Use
A 6% hydrogen peroxide developer (also called 20 volume in the European system) is the standard for permanent color that deposits a new shade without major lifting. It is appropriate for:
- Covering gray hair
- Refreshing existing color
- Going one to two shades darker than the natural hair
- Depositing vivid or fashion colors over pre-lightened hair
The EVESEL Hair Dye Oxidizer 6% in 150g is sized for single-use applications or small-section coloring. The 800ml Gold Hair Color Professional Oxidizer bottles are the same concentration in a larger volume for repeated use or professional settings.
Decolorizer Format - Lightening Applications
The EVESEL Hair Dye Oxidizer 6% 150g is labeled as a decolorizer-compatible size, indicating it is formulated to pair with bleach powder as well as with permanent color. When used with bleach powder, the oxidizer provides the peroxide activation needed to lift the hair's natural melanin without depositing color pigment - the result is lightened hair ready for toning or vivid color.
The 6% concentration in a decolorizer application provides a moderate lift. For more aggressive lightening, a higher-concentration developer (9% or 12%) would be used, but those are not the primary product in this range. Do not use decolorizer products without bleach powder - the oxidizer alone will not lighten hair effectively and will unnecessarily stress the cuticle.
Gold Hair Color Oxidizer - Salon-Scale Bottles
EVESEL's Gold Hair Color Professional Oxidizer (800ml) and Gold Hair Color 2nd 6th Oxidizer (800ml) are large-format bottles intended for professional or high-frequency home use. The 800ml size covers multiple full-head applications from a single bottle, which is practical for salons or households where hair coloring happens regularly.
The 2nd 6th designation in the product name refers to the formulation variant - EVESEL's Gold Hair Color line numbers its developer variants to match specific dye series. When in doubt, pair the developer with the dye from the same Gold Hair Color series for optimal mixing ratios.
Mixing Ratios - Getting the Developer-to-Dye Ratio Right
Standard permanent color mixing ratios are 1:1 or 1:1.5 (dye to developer by weight). EVESEL's hair dye packaging specifies the recommended ratio for each product - follow the instructions on the dye packaging rather than applying a generic ratio, as different formulations require different developer volumes for consistent coverage and color results.
Using too little developer produces uneven coverage and underdeveloped color. Using too much thins the mixture, which can cause it to drip, extend processing time, and produce lighter-than-expected results. A kitchen scale is more reliable than measuring by eye.
Processing Time and Heat
Standard permanent color with a 6% developer processes in 30-45 minutes at room temperature. Processing times vary by hair type, desired result, and ambient temperature. Heat (from a processing cap or hair dryer on low) can reduce processing time by 10-15 minutes but also increases the risk of over-processing - particularly for porous or damaged hair that lifts faster than healthy hair.
Set a timer rather than estimating. Under-processed color can appear flat and fade quickly. Over-processed color can produce an unwanted tonal shift (typically orange in brown-tinted hair, or yellow-green in bleached hair).
Safety and Handling
Hydrogen peroxide is an oxidizing agent that can cause skin and eye irritation. Standard precautions for at-home use:
- Wear the gloves included with hair dye kits or purchase nitrile gloves separately.
- Keep the mixture away from the eyes. If contact occurs, rinse with water for 15 minutes.
- Do not mix the developer with any product other than the intended dye - hydrogen peroxide reacts with many organic compounds.
- Do not store mixed product. Use immediately after mixing; discard any remainder. Mixed oxidizer continues reacting and the container can pressurize.
- Conduct a patch test 48 hours before full application, especially if using a new dye formulation.
Storing Unused Oxidizer
Store hydrogen peroxide developer in a cool, dark location - heat and light accelerate decomposition and reduce the effective concentration over time. Keep the lid tightly sealed. A 6% developer stored properly in an unopened bottle typically retains full potency for 12-18 months. After opening, use within 6 months. If the bottle cap feels pressurized or the liquid has turned noticeably foamy at rest, the peroxide has begun to break down and the concentration will be lower than labeled.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
What is a hair oxidizer and why do I need one?
A hair oxidizer (developer) is the hydrogen peroxide component that activates permanent or demi-permanent hair color. Hair dye pigments are inert on their own - the oxidizer starts the chemical reaction that opens the cuticle and deposits the new color. You need it whenever you use a permanent or semi-permanent color kit that does not include a developer.
What is 6% oxidizer used for in hair coloring?
6% hydrogen peroxide (20 volume in the European system) is the standard developer for covering gray, refreshing existing color, or going one to two shades darker. It is the most commonly used concentration for at-home permanent color. For significant lightening, a higher concentration (9% or 12%) would be needed.
Is the 800ml EVESEL oxidizer only for professional salon use?
No. The 800ml size is practical for anyone who colors their hair regularly - it covers multiple full-head applications from one bottle. At-home users who color every 4-6 weeks will use the bottle within a reasonable time frame. Just store it properly with the lid sealed once opened.
What mixing ratio should I use for EVESEL dye and oxidizer?
Follow the instructions on the specific dye packaging. Standard ratios are 1:1 or 1:1.5 (dye to developer by weight), but EVESEL specifies the correct ratio for each formulation. Using a kitchen scale for accuracy gives more consistent results than measuring by volume.
Can I use the 6% oxidizer with bleach powder for lightening?
Yes. The 150g EVESEL Hair Dye Oxidizer 6% is suitable for mixing with bleach powder for lightening. It provides a moderate lift. For more aggressive bleaching, higher-concentration developers (9-12%) are typically used, but those are not currently the focus of this range on skinsli.
How should I store an opened bottle of EVESEL hair oxidizer?
Keep the lid tightly sealed and store in a cool, dark location. Use within 6 months of opening. If the bottle cap feels pressurized when you open it, or if the liquid is unusually foamy at rest, the peroxide has begun to decompose and the concentration will be lower than labeled.
Is hair oxidizer safe to use without gloves?
No. Always wear gloves when mixing and applying hair oxidizer. Hydrogen peroxide is an oxidizing agent that can cause skin irritation and dryness with direct contact. If you do not have gloves from a hair dye kit, use nitrile gloves. Avoid contact with eyes.
How much oxidizer do I need for a full-head color application?
A standard full-head permanent color application uses approximately 100-150ml of developer mixed with the corresponding amount of dye. At a 1:1 ratio with 100ml of dye, that's about 100ml of developer. The 150g bottle is sized for one application; the 800ml bottle covers five to seven full-head applications.
Are EVESEL oxidizer products on skinsli genuine Korean products?
Yes. skinsli sources EVESEL products from authorised Korean wholesale channels. The products are Korean domestic-market formulas.
How long should I leave EVESEL hair color and oxidizer on my hair?
Typically 30-45 minutes at room temperature with a 6% developer, but follow the instructions on the dye packaging - processing times vary by the specific dye formulation and the desired result. Set a timer; do not estimate by feel.