GOLDWELL - TOPCHIC_Goldwell Colorance 2% / 7vol Liquid Developer Lotion for Colorance 100ml / 3.4oz_Cosmetic World
Goldwell - Topchic Goldwell System Developer - 2% 7 Vol Liquid Developer Lotion for Colorance $5.99
Goldwell System Developer - 2% 7 Vol Liquid Developer Lotion for Colorance Size: 100ml / 3.4oz The Goldwell System Developer is a professional-grade liquid developer lotion designed specifically for use with Colorance demi-permanent hair color. With a 2% (7 volume) strength, this gentle formula provides precise color development, ensuring vibrant and long-lasting results without damaging the hair. Features: 2% (7 Vol) Developer: Ideal for demi-permanent hair color applications, delivering reliable color activation while being gentle on hair. For Use with Goldwell Colorance: Specially formulated to work seamlessly with Colorance shades, ensuring consistent and predictable results every time. 100ml (3.4 fl. oz.) Size: Perfect for salon use or at-home application, offering enough product for multiple applications. Low-Volume Formula: The 7-volume strength is suitable for subtle color changes and toning, reducing the risk of damage to the hair. Easy Application: Smooth, creamy consistency allows for even distribution and accurate color development. Trusted Goldwell Quality: From a brand known for its innovative hair color technologies and salon-quality products. Why You Should Buy: Safe and Gentle: Ideal for those seeking a low-volume developer that minimizes hair damage while delivering excellent color results. Professional-Grade: Get salon-quality results at home or in the salon, trusted by professionals worldwide. Perfect for Demi-Permanent Color: Specifically designed for use with Goldwell’s Colorance line, this developer ensures your hair color looks vibrant and lasts longer.
GOLDWELL - TOPCHIC_Goldwell Topchic/Colorance 2%/7 Vol Liquid Developer Lotion with Bondpro+ 1L_Cosmetic World
Goldwell - Topchic Colorance 2%/7 Vol Liquid Developer Lotion with Bondpro+ $24.99
Goldwell System 2%/7 Vol Liquid Developer Lotion with Bondpro+ Disclaimer: The tools and accessories in the pictures are only for illustration purposes. They are sold separately from the product you ordered New & Improved Developer Lotion - Liquid Developer lotion available in 2 %/7 Vol - to be used with Colorance Demi-Permanent Hair Color. - Formula with patented Bondpro+ Technology- Sustainability replenishes lipids inside the hair for improved hair structure- Improved consistency for ideal spreadability and perfect adherence to hair- New bottle shape for easy handling while mixing, optimal squeezing and perfect compatibility with the Depot Can System. PROFESSIONAL USE ONLY. The sale and use of this product is intended for licensed professionals only.  Cosmetic World will not be held responsible by anyone who buys and/or uses this product. Chemical products may cause allergic reactions, which in rare instances can be severe. Conduct sensitivity and allergic patch test 48 hours prior to each application. These products must not be used on eyelashes or eyebrows.
REFECTO CIL_3% / 10Vol Oxidant Liquid 100ml / 3.38oz_Cosmetic World
RefectoCil 3% / 10Vol Oxidant Liquid 100ml / 3.38oz $16.99
RefectoCil 3% / 10Vol Oxidant Liquid RefectoCil 3% / 10Vol Oxidant Liquid is a stabilised developer especially formulated to be used with RefectoCil tints. RefectoCil 3% / 10Vol Oxidant Liquid guarantees the widely known perfect tinting results with RefectoCil tints. NET WEIGHT: 100ml / 3.38oz HOW TO USE? Mix 10 drops of RefectoCil Oxidant 3% liquid with 2 cm of tint into a creamy paste using the application stick Apply the paste without delay following the instructions for use of RefectoCil tints. Contains hydrogen peroxide. Avoid contact with eyes. Rinse immediately if product comes into contact with then. Wear suitable gloves.  For professional use only, not self-application. Please follow instructions. Ingredients: Aqua, Hydrogen Peroxide, Triethanolamine, Phosphoric Acid, C12-13 Pareth-9.
REDKEN - SHADES EQ_Shades EQ Gloss Processing Solution 1L / 33.8oz_Cosmetic World
Redken - Shades EQ Shades EQ Gloss Processing Solution from $13.99
Redken Shades EQ Gloss Processing Solution  Disclaimer: The tools and accessories in the pictures are only for illustration purposes. Please note that they are sold separately from the product you ordered. Elevate your hair color game with the Redken Shades EQ Gloss Processing Solution. Specifically designed for professional use, this solution pairs perfectly with Redken's Shades EQ hair gloss to deliver stunning results every time. With its gentle formula and advanced technology, achieves the ideal tone, depth, and durability without compromising your hair's natural pigment. Benefits & Features Acidic Hair color: Formulated as an acidic demi-permanent hair color, Shades EQ offers gentle processing for outstanding condition and shine benefits. No Ammonia: Enjoy a comfortable experience without the overpowering smell typically associated with hair coloring processes. Adds Shine: Infused with wheat amino acids, this solution conditions the hair, leaving it remarkably shiny. Color Correcting: Say goodbye to brassy ends and faded roots as Shades EQ gently blends and tones for a flawless finish. Quick Processing: In just 20 minutes, achieve a gorgeous hair color without the wait. Low Commitment: Ideal for those seeking high shine and subtle color without worrying about visible regrowth. What Sets it Apart Redken Shades EQ isn't just a hair gloss; it's a hair color that thinks it's a conditioner. Unlike traditional hair coloring products, Shades EQ offers a unique acidic formula that prioritizes hair health and shine. Its ability to correct color imperfections and provide a quick, low-commitment solution sets it apart in the market. The Solution to Your Hair Woes Whether you're looking to refresh your current color, correct discoloration, or simply add shine to your hair, Redken Shades EQ Gloss Processing Solution has you covered. Its gentle formula ensures outstanding results without compromising hair health, providing a quick and effective solution for your hair color needs. Specifications Size:1L / 33.8oz and 237ml / 8oz Hydrogen Peroxide Developer pH: Acidic Formulation: Demi-permanent PROFESSIONAL USE ONLY. The sale and use of this product is intended for licensed professionals only. Cosmetic World will not be held responsible by anyone who buys and/or uses this product. Chemical products may cause allergic reactions, which in rare instances can be severe. Conduct sensitivity and allergic patch test 48 hours prior to each application. These products must not be used on eyelashes or eyebrows. Ready to unveil the magic of Redken Shades EQ Gloss Processing Solution? Purchase today and experience the difference!
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REDKEN - SHADES EQ_Shades EQ Processing Solution for Precise Application (Gloss to Gel)_Cosmetic World
Redken - Shades EQ Shades EQ Processing Solution for Precise Application (Gloss to Gel) from $18.50 $20.00
Redken Shades EQ Gloss Processing Solution For Precise Application Introducing the Redken Shades EQ Gloss Processing Solution for precise application, the ultimate tool for professional hairstylists seeking precision and control in hair colouring. This innovative developer transforms any Shades EQ Gloss into a versatile gel format, making it perfect for techniques that require meticulous application. Whether you’re defining lowlights, adding contour, or root smudging, this processing solution ensures incredible dimension and the cleanest foils. Disclaimer: The tools and accessories in the pictures are only for illustration purposes. Please note that they are sold separately from the product you ordered. Benefits & Features Transformative Gel Format: Turns your Shades EQ Gloss into a gel for greater control. Precision Placement: Ideal for lowlights, contouring, and defining. Clean Foils: Achieve the cleanest foils with incredible dimension. Ultimate Control: Root smudge with amazing saturation and control during application. Consistent Results: Maintains the same mixing and processing time – 20 minutes, up to 40 for gray hair. What Sets It Apart? The Redken Shades EQ Gloss Processing Solution stands out due to its ability to convert a liquid gloss formula into a gel, providing unparalleled control and precision. This transformation is especially beneficial for techniques that demand accuracy, such as lowlighting and contouring. No other product on the market offers this level of versatility, ensuring you deliver professional-grade results every time. Solve Your Hair Coloring Challenges If you’re a professional hairstylist looking to elevate your hair coloring techniques, this processing solution is your go-to product. It addresses common challenges such as messy applications and uneven color distribution by turning the liquid gloss into a gel, allowing for precise application. This ensures your clients leave the salon with perfectly applied color, enhancing their satisfaction and your reputation. Specifications Processing Time: 20 minutes (up to 40 minutes for gray hair). Professional Use Only: Intended for licensed professionals. Conduct sensitivity and allergic patch tests 48 hours before application. Not for use on eyelashes or eyebrows. Disclaimer: The sale and use of this product is intended for licensed professionals only. Cosmetic World will not be held responsible by anyone who buys and/or uses this product. Chemical products may cause allergic reactions, which in rare instances can be severe. Ready to transform your hair coloring techniques? Order the Redken Shades EQ Gloss Processing Solution for precise application today and experience the ultimate in control and precision. Enhance your professional toolkit and deliver stunning results with every application. Don't wait – elevate your hair artistry now!
TIGI_8.5 Volume/2.55% Activator with aloe and nettle 1L_Cosmetic World
Tigi 8.5 Volume/2.55% Activator with aloe and nettle 1L $12.99
TIGI creme activator is designed to work with all products within the TIGI colour range. Activators deliver controlled processing time based on the volume or % strength. Smooth and creamy stabilised activators create accurate level, tone, and consistency. Created for colour, for ease of mixability, consistent viscosity, ease of application,and optimum lift and coverage. Directions Always measure or weigh the appropriate amount of TIGI colour rich creme activator for the chosen TIGI colour range. Check desired level of lift, deposit of level, tone and coverage on non-pigmented hair before removal of the colour (processing time may need to be extended for different hair types and textures). TIGI colour rich creme activators should always be used with all TIGI colour products for maximum benefits of the range.TOP TIPSApplication is always important when lightening. Layer and place enough TIGI Colour lift emulsion onto the hair in order for the product to penetrate the hair to acheive desired lifting and toning results.Fine delicate hair lines will accept tone more easily, apply to hair line last or use 100/0 or 10/0.Development time may be extended up to 15 minutes if required on coarser thicker hair textures.Remember TIGI Colour lift is designed to lift and tone in 35 minutes, so always process for the full time.For great blondes, use enough product for enough time.
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SCHWARZKOPF - ESSENSITY_Essensity Oil Developer 5.5%/18 Vol_Cosmetic World
Schwarzkopf - Essensity Essensity Oil Developer 5.5%/18 Vol $17.99
Essensity 5.5%/18 Vol Oil Developer with Phytolipid Technology  1L/33.8oz ESSENSITY Oil Developer is a rich cream peroxide emulsion that works in harmony with the organic ingredients of Schwarzkopf Essensity hair color to produce beautiful, long-lasting hair color. Schwarzkopf Essensity Oil Developer contains beeswax designed to feed the hair, giving it suppleness and a dazzling shine for a healthy, vibrant look. Schwarzkopf ESSENSITY Oil Developer ensures that the ammonia-free Essensity colors provide the optimum effect.  Features & Benefits: Color Enhancement: Unlock the true potential of your color with the power of Phytolipid Technology, enriching shades with amplified vibrancy and depth. Care-Focused Formula: While achieving darker and more intense hues, these developers also offer nourishment and protection to your hair during the coloring process. Optimized for Excellence: Specially formulated to synergize with ESSENSITY Permanent Color Creme, ensuring consistent, impeccable results. Schwarzkopf Essensity Oil Developer is available in 4 different strengths to ensure you get perfect results: 2.5% (8 volume) - for depositing pure color or for coloring darker. Effective up to a maximum of 30% white hair. 5.5% (18 volume) - lifts up to 2 levels and effective on up to 100% white hair. 8.5% (28 volume) - lifts up to 3 levels and designed for Nature+ shades. 11.5% (38 volume) - gives up to 4 levels of lift with the ultra blonde (10- series) shades. PROFESSIONAL USE ONLY. The sale and use of this product is intended for licensed professionals only.  Cosmetic World will not be held responsible by anyone who buys and/or uses this product. Chemical products may cause allergic reactions, which in rare instances can be severe. Conduct sensitivity and allergic patch test 48 hours prior to each application. These products must not be used on eyelashes or eyebrows.
SCHWARZKOPF - ESSENSITY_Essensity Oil Developer 8.5%/28 Vol_Cosmetic World
Schwarzkopf - Essensity Essensity Oil Developer 8.5%/28 Vol $17.99
Essensity 8.5%/28 Vol Oil Developer with Phytolipid Technology  1L/33.8oz ESSENSITY Oil Developer is a rich cream peroxide emulsion that works in harmony with the organic ingredients of Schwarzkopf Essensity hair color to produce beautiful, long-lasting hair color. Schwarzkopf Essensity Oil Developer contains beeswax designed to feed the hair, giving it suppleness and a dazzling shine for a healthy, vibrant look. Schwarzkopf ESSENSITY Oil Developer ensures that the ammonia-free Essensity colors provide the optimum effect.  Features & Benefits: Color Enhancement: Unlock the true potential of your color with the power of Phytolipid Technology, enriching shades with amplified vibrancy and depth. Care-Focused Formula: While achieving darker and more intense hues, these developers also offer nourishment and protection to your hair during the coloring process. Optimized for Excellence: Specially formulated to synergize with ESSENSITY Permanent Color Creme, ensuring consistent, impeccable results. Schwarzkopf Essensity Oil Developer is available in 4 different strengths to ensure you get perfect results: 2.5% (8 volume) - for depositing pure color or for coloring darker. Effective up to a maximum of 30% white hair. 5.5% (18 volume) - lifts up to 2 levels and effective on up to 100% white hair. 8.5% (28 volume) - lifts up to 3 levels and designed for Nature+ shades. 11.5% (38 volume) - gives up to 4 levels of lift with the ultra blonde (10- series) shades. PROFESSIONAL USE ONLY. The sale and use of this product is intended for licensed professionals only.  Cosmetic World will not be held responsible by anyone who buys and/or uses this product. Chemical products may cause allergic reactions, which in rare instances can be severe. Conduct sensitivity and allergic patch test 48 hours prior to each application. These products must not be used on eyelashes or eyebrows.
Goldwell - Men Reshade_Men ReShade Developer Concentrate Set_Cosmetic World
Goldwell - Men Reshade Men ReShade Developer Concentrate Set $35.99
Goldwell Men ReShade Developer Concentrate 250ml / 8.4oz Transform your hair care routine with Goldwell Men ReShade Developer Concentrate—a revolutionary product designed for quick, effective, and natural-looking grey blending. Specifically formulated for use with Goldwell Men ReShade Grey Blending Power Shot, this developer guarantees a fast, 5-minute processing time while delivering professional-quality results. Its oxidative dye foam technology ensures even application and optimal blending of grey hair for a youthful, polished look. Benefits & Features Guaranteed 5-Minute Processing: Saves time without compromising quality—perfect for busy professionals or salon environments. Precision Formulation: Designed exclusively to pair with the Goldwell Men ReShade Grey Blending Power Shot for best results. Innovative Foam Application: Creates an oxidative dye foam for smooth, even coverage. Effortless Application: Use the specialized application bottle for mess-free and convenient usage. Reliable Performance: Consistent, natural-looking results every time. What Makes It Stand Out? Unlike other developers, Goldwell Men ReShade Developer Concentrate is tailored for one specific purpose—seamless grey blending in just 5 minutes. The innovative foam technology simplifies the application process, ensuring the dye distributes evenly across all hair types and lengths. Competitors often promise speed or quality—not both. With Goldwell Men ReShade, you get it all: speed, precision, and unmatched results. The Perfect 5-Minute Solution If you're frustrated with visible grey hairs but don't have time for long, drawn-out coloring sessions, Goldwell Men ReShade Developer Concentrate is your answer. In just 5 minutes, it blends greys naturally, leaving your hair vibrant and refreshed. Ideal for personal use or in professional salons, it ensures you or your clients achieve a polished look without the hassle of extended processing times. Specifications Usage: For use exclusively with Goldwell Men ReShade Grey Blending Power Shot. Processing Time: 5 minutes at room temperature. Application: Mix 1:1 with Grey Blending Power Shot and apply to dry hair. Bottle Design: Equipped with a unique application bottle to ensure even distribution. Final Step: Rinse thoroughly and shampoo with Goldwell Dualsenses Shampoo for the best finish. Directions for Use Mix Goldwell Men ReShade Developer Concentrate with Goldwell Men ReShade Grey Blending Power Shot in a 1:1 ratio. Gently swing the application bottle to mix. Apply to dry hair evenly and massage thoroughly. Allow to process at room temperature for no more than 5 minutes. Rinse until water runs clear. Finish with Redken Dualsenses Shampoo for optimal results. Ready to achieve flawless grey blending in just 5 minutes? Order your Goldwell Men ReShade Developer Concentrate today and experience the difference. Your hair—and your schedule—will thank you!
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OYA - OWN YOUR ART_OYA Lotion 20 vol 6%_Cosmetic World
OYA - Own Your Art OYA Lotion 20 vol 6% $15.99
OYA Lotion 6% / 20 Vol -  Specially designed for Oya permanent colors. Delivers the best result of Oya colors. Consistent brilliant colors with long lasting resistance to fading. Cream texture allows easy mixture and application. Easy 1:1 mixing ratio. Choosing the right volume: 10 volume (3%): All gray coverage and deposit only 20 volume (6%): Up to 2 levels of lift 30 volume (9%): 2 to 3 levels of lift 40 volume (12%): 3 or more levels of lift 
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JOICO_Vero K-Pak Chrome Activator 950ml / 32oz_Cosmetic World
Joico Vero K-Pak Chrome Activator $18.99
Joico Vero K-Pak Chrome Activator 950ml / 32oz No lift cream developer works best with Vero K-Pak Chrome demi-permanent color or toner. Deliver maximum color development without lightening original hair color. True to tone color with consistent results. Creamy texture with no dripping. How to use? Mix well (1:1) with Vero K-Pak Chrome Color Follow instructions on the color Saturate and process for the instructed time Rinse thoroughly
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BERRYWELL_3% / 10 Vol Creamy Developer Lotion 61ml / 2.06oz_Cosmetic World
Berrywell 3% / 10 Vol Creamy Developer Lotion 61ml / 2.06oz $12.99
Berrywell 3% / 10 Vol Creamy Developer Lotion Creamy texture for outstanding consistency even application. Gentle formula with only 3% peroxide. Built-in dispensing tip that is easy to use and prevent oxidization. Pleasant and relaxing coloring experience with no dripping feature. Directions Mix 1:1 with Augenblick Cream Hair Dye (2cm Dye : 10 drops Developer Lotion) Apply using applicator Let process according to instruction Cleanse with dry wipe then wet cotton wipe
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WELLA - COLOR CHARM_20 Volume Cream Developer 32oz_Cosmetic World
Wella - Color Charm 20 Volume Creme Developer $14.99
Wella Color Charm 20 Volume Clear Developer – Reliable Hair Color Developer Product Description Wella Color Charm 20 Volume Clear Developer is a versatile, professional-quality developer designed to activate permanent hair color and lightening services with consistent, dependable results. Offering moderate lift, this 20 volume developer is ideal for covering gray, lifting natural hair color, and achieving even, long-lasting color results. While it’s not a shampoo, this developer fits seamlessly into a complete hair color and shampoo care routine, helping ensure color looks vibrant and healthy when followed with a nourishing, color-safe shampoo. Benefits & Features 20 volume strength for moderate lift and gray coverage Clear formula allows precise color mixing and predictable results Smooth consistency for easy application and even saturation Ideal for permanent hair color and lightening services Helps achieve vibrant, long-lasting color results Suitable for professional salons and experienced at-home users What Makes Wella Color Charm 20 Volume Developer Stand Out? The clear developer formula ensures accurate color blending and reliable processing, making it a favorite among hairstylists. It delivers controlled lift without excessive damage and works beautifully when paired with proper aftercare, including a high-quality shampoo designed for color-treated hair. Who Is This Product For? Professional hairstylists and salon colorists Beauty enthusiasts comfortable with permanent hair color Anyone seeking reliable gray coverage or moderate lift Ideal for use with a color-safe shampoo for ongoing hair care Users looking for consistent, salon-quality color results Specifications Brand: Wella Product Name: Color Charm 20 Volume Clear Developer Strength: 20 Volume Formula: Clear liquid developer Use: Permanent hair color activation and lightening Professional Use: Yes Sizes: Available in various retail and professional sizes Get dependable, professional hair coloring results with Wella Color Charm 20 Volume Clear Developer. Add it to your cart today and enjoy salon-quality performance from the comfort of your home. 32 fl. oz. (946 ml)
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TOCCO MAGICO - DELIGHT_Delight Oxi Plus 1L_Cosmetic World
Tocco Magico - Delight Delight Oxi Plus $13.99
Tocco Magico Delight Oxi Plus 1L Fluid developer emulsion enriched with conditioning elements, that protect hair during  bleaching process, leaving it soft and shiny, De light OXI Plus is to be used with de light POWDER Plus.  Directions Mix in the ratio of 1:1 (1 part de light oxy + 1 part powder) 
TOCCO MAGICO_Oxi Color Peroxide 1L_Cosmetic World
Tocco Magico Oxi Color Peroxide $18.99
Tocco Magico Oxi Color Peroxide 1000ml / 1L Tocco Magico offers various developers designed to work synergistically with each color segment. Available in 10, 20, 30 , 40 Volume. Our new Oxi Color Developers are to be used for ColorTon, MultiComplex, FreeLux and De Light Universal (Violet) Bleach, DeColor Cream and Free Blond. Oxi Cream Color Developers feature conditioning moisturizers to protect the hair during the lightening process. This proprietary formula contains 99% pure organic vegetable ingredients with no synthetic ingredients. Available in 10, 20, 30 and 40 vol.
FAIPA_Oxy Professional Peroxide_Cosmetic World
Faipa Oxy Professional Peroxide $3.99
Faipa Oxy Professional Peroxide Faipa Oxy Professional Peroxide is a premium stabilized oxidizing creamy emulsion designed to enhance your hair coloring and bleaching experience. This versatile product blends seamlessly with both color and bleaching formulations, ensuring consistent and vibrant results every time. Available in four variants: 10, 20, 30, and 40 volume, Faipa Oxy Professional Peroxide offers the perfect strength for every hair type and desired outcome. Benefits & Features Seamless Blending: Faipa Oxy Professional Peroxide mixes effortlessly with colors and bleaches for uniform application and vibrant results. Stabilized Formula: The creamy emulsion remains consistent throughout the application process, ensuring reliable performance. Multiple Strengths: Choose from 10, 20, 30, and 40 volume variants to achieve the perfect lift and tone for any hair type. Professional Quality: Trusted by professionals for its superior performance and reliability. What Sets Faipa Oxy Professional Peroxide Apart? Faipa Oxy Professional Peroxide sets itself apart with its stabilized formula that ensures consistent results and its ability to blend perfectly with both color and bleaching products. Unlike other peroxides, it offers a creamy texture that is easy to apply and works efficiently, reducing application time and enhancing the overall coloring experience. Tired Of Inconsistent Hair Coloring Results? Faipa Oxy Professional Peroxide provides a reliable solution. Its stabilized, creamy emulsion guarantees a smooth application and uniform results, minimizing the risk of patchiness or uneven color. Whether you’re a professional stylist or a DIY enthusiast, Faipa Oxy Professional Peroxide ensures your hair coloring projects are always successful. Specifications Product Type: Stabilized oxidizing creamy emulsion Variants: 10 volume, 20 volume, 30 volume, 40 volume Usage: Suitable for blending with hair colors and bleaching products Packaging: Secure, easy-to-use containers for precise application Ready to elevate your hair coloring experience? Try Faipa Oxy Professional Peroxide today and see the difference for yourself. Whether you're aiming for subtle highlights or dramatic color changes, Faipa Oxy Professional Peroxide has you covered. Order now and transform your hair with professional-grade results from the comfort of your home.

Developer comes in different strengths, the common ones being 10 volume, 20 volume, 30 volume and 40 volume. It’s possible to buy peroxide in stronger concentrations but they’re much too strong to use on hair and should be avoided. Developer strength is sometimes represented as a percentage. 6% and 20 vol. are the same strength.

Equivalent Developer Strengths;

  • 10 Volume - 3%
  • 20 Volume - 6%
  • 30 Volume - 9%
  • 40 Volume - 12%

What strength/volume developer should I use?

10 volume is ideal for use when you don’t want the natural hair color to be lightened by the dyeing process. It’s used in toners and color glazes. These types of dyes are known as “deposit-only”.

20 volume peroxide is commonly used with semi-permanent and permanent hair colors. It can have a lightening effect on natural, undyed hair of 1 or 2 shades when used with permanent color.
When mixed with bleach powder, 20 volume developer will lighten virgin hair by about 5 levels.

30 volume developer is used for lifting out color. Its main use is in bleaching and it can lighten around 7 levels depending on the bleach powder used.

40 volume is occasionally used to lighten very dark, stubborn hair as part of the bleaching process. It lightens quickly and its effects are harsher than lower concentrations. 40 volume is not recommended for on-the-scalp use. Using 40 volume developer can cause hair damage and chemical burns if not used correctly. Instead, using multiple applications using lower volume peroxide will allow more controlled lightening.

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