L’ORÉAL PROFESSIONNEL INOA 4 BROWN

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L’Oréal Professionnel iNOA 4 Brown is an ammonia-free permanent hair color powered by patented ODS² (Oil Delivery System) technology containing 60% oil, delivering rich, natural brown results with up to 100% grey coverage and up to 3 levels of lift in just 35 minutes . This Level 4 fundamental shade—also described as 4.0/4NN Natural Brown—provides true-to-color, natural brown results with excellent depth and dimension .
The revolutionary formula replaces traditional ammonia with an oil-based delivery system, providing a pleasant, odorless coloring experience while offering up to 48% more shine, 6 weeks of anti-dryness effect, and uncompromised scalp comfort . The vegan, wax-free formula features a fluid, non-drip texture that is easy and fast to apply, mix, and rinse .
Mix at a 1:1 ratio (1 tube color to 1 part developer) with iNOA Oil Developer 10-volume (3%), 20-volume (6%), or 30-volume (9%), depending on desired lift . For white hair coverage up to 70%, use the target shade alone; for 70-100% white hair with cool coverage, mix ½ target shade with ½ Natural shade at the same level . Development time is 35 minutes at room temperature.
This product is intended for professional use only. To use, mix 60g of iNOA 4 Brown with 60g of iNOA Oil Developer, apply to dry, unwashed hair using sectioning techniques, process for 35 minutes, then emulsify gently, rinse thoroughly, and finish with iNOA Post-Color Shampoo or Metal Detox Shampoo . Always perform a patch test 48 hours before any coloring service.
Description

Table of Contents

L’ORÉAL PROFESSIONNEL INOA 4 BROWN

PRIMARY USES

1. Ammonia-Free Permanent Hair Color Powered by Oil Delivery System
  • What it does: iNOA 4 is an ammonia-free permanent hair color formulated with the exclusive ODS² (Oil Delivery System) patented technology containing 60% oil, which replaces traditional ammonia to deliver high-impact color while providing optimal scalp comfort . The formula is completely odorless and vegan, containing zero animal-derived ingredients or byproducts, making it a cleaner choice for professional coloring services .
  • How it helps your hair: For the person who is sensitive to strong chemical odors or experiences scalp discomfort with traditional ammonia-based colors, this provides a pleasant, odorless coloring experience. For anyone seeking rich, long-lasting brown color without compromising hair health or scalp comfort, this means a professional formula that respects both hair integrity and sensory comfort.
2. 4 Brown Shade
  • What it does: Shade 4 is a Brown fundamental shade, also described as 4.0/4NN Natural Brown, delivering a rich, natural brown result with excellent depth and dimension . This Level 4 fundamental shade provides beautiful, natural-looking results for clients seeking a versatile brown with no unwanted warm or cool reflects .
  • How it helps your hair: For the person wanting a rich, natural brown that adds warmth and depth without being too dark, this provides a versatile Level 4 shade that works beautifully for both full coverage and root touch-ups. For anyone who wants their brown hair to look healthy, vibrant, and natural, this means a shade formulated for pure, authentic brown results.
3. Up to 100% Grey Coverage with Up to 3 Levels of Lift
  • What it does: This permanent hair color delivers up to 100% coverage of grey and white hair while providing up to 3 levels of lift in just 35 minutes, making it suitable for clients with significant grey coverage needs who also want to lighten their base . The 60% oil base helps preserve the natural protective film of the hair while ensuring maximum color intensity .
  • How it helps your hair: For the person with grey or white hair who wants complete coverage while also achieving a rich brown result, this provides a single-product solution that addresses both needs. For anyone who has struggled with patchy coverage or resistance to color, this means a professional formula that delivers consistent, beautiful results.
4. Up to 48% More Shine and 6 Weeks of Hydration
  • What it does: The ODS technology delivers up to 48% more shine compared to uncolored hair, with results lasting through 6 weeks of intensive moisture balance . The formula provides an anti-dryness effect, keeping hair hydrated, soft, and healthy-looking between salon visits .
  • How it helps your hair: For the person who wants their brown color to look fresh, glossy, and healthy beyond the first week, this provides long-lasting shine and hydration. For anyone who has experienced dry, dull hair after coloring, this means a formula that maintains moisture and radiance.
5. Odorless, No-Drip Formula for Precise Application
  • What it does: The formula features a smooth, creamy, fluid texture that is odorless, non-drip, and easy to mix, apply, and rinse, allowing for uniform coverage from roots to ends . Additive waxes have been eliminated, making the application smoother and the product easier to work with.
  • How it helps your hair: For the stylist performing precise color work, this provides a manageable, fluid formula that enables clean, professional application. For the client, the consistency ensures even coverage and predictable results with minimal mess.
6. Vegan Formula with Eco-Responsible Packaging
  • What it does: The formula is vegan, containing no animal-derived ingredients or by-products, and is certified as such . The product is manufactured in Spain and Belgium, ensuring high-quality production standards .
  • How it helps your hair: For the person who prefers vegan, cruelty-free beauty products, this provides a professional color option that aligns with their values. For salons seeking more sustainable practices, this means a product that prioritizes ethical formulation.

SECONDARY USES

1. Root Touch-Up on Colored Hair: Apply only to regrowth area where natural hair needs to be recolored to match previously colored lengths, using 20 or 30 volume developer at 1:1 ratio, processing for 35 minutes. For the person maintaining their brown color between full applications, this provides a precise root touch-up solution that keeps color consistent and even.
2. Global Application on Virgin Hair: Apply evenly to dry, unwashed virgin hair for an all-over brown transformation, using 20 volume for up to 2 levels lift or 30 volume for up to 3 levels lift, processing for 35 minutes. For the person wanting to achieve a rich, natural brown from natural hair, this provides the ideal single-process solution.
3. Grey Coverage for Resistant Hair: For clients with up to 70% white hair, use the target shade alone with 20 or 30 volume developer; for 70-100% white hair coverage with cool reflects, mix ½ target shade with ½ Natural shade at the same level . For the person with emerging grey who wants full, natural-looking coverage, this provides a customizable approach.
4. Color Refreshing Service: For a quick refresh of faded color on mid-lengths and ends after a root touch-up, apply with low-volume developer for reduced processing time to revive vibrancy without over-darkening. For the person whose ends have faded faster than their roots, this provides a seamless refresh that extends the life of their color.
5. Take Through with iNOA (Virgin Hair Only): For slight color changes, take through for the final 5 minutes; for moderate changes, final 20 minutes; for dramatic changes, take through immediately. For the stylist performing full-color transformations on virgin hair, this provides professional guidelines for optimal results.
Additional information
Pack size250ML, 25Ml
KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

  • Brand: L'Oréal Professionnel Paris
  • Product Name: iNOA Permanent Hair Color / INOA 4 Brown
  • Shade: 4 Brown / 4.0 Intense Brown / 4/4N Natural Brown 
  • Shade Level: Level 4 (Brown) Fundamental Shade
  • Product Type: Ammonia-free permanent hair color / Cream hair dye
  • Key Benefits: Ammonia-free, up to 100% grey coverage, up to 3 levels lift, 48% more shine, 60% oil formula, ODS technology, odorless, vegan 
  • Key Technology: ODS² (Oil Delivery System) patented technology 
  • Volume: 60g / 60ml / 2.1 oz 
  • Mixing Ratio: 1:1 (60g color to 60g developer) 
  • Recommended Developers: iNOA Oil Developer 10-vol (3%), 20-vol (6%), or 30-vol (9%) 
  • Processing Time: 35 minutes 
  • Grey Coverage: Up to 100% 
  • Maximum Lift: Up to 3 levels 
  • Formula Integrity: Ammonia-free, vegan (no animal-derived ingredients or by-products), wax-free 
  • Proven Results: 48% more shine vs uncolored hair; up to 100% grey coverage 
  • Made in: Spain, Belgium 
  • Product Codes: UPC 884486511751 ; EAN 3474637129965 

2. TECHNICAL & FORMULATION PROPERTIES

  • Key Technology 1: ODS² (Oil Delivery System) – patented technology using 60% oil to deliver color without ammonia 
  • Key Technology 2: 60% Oil base – preserves natural protective film of hair, provides optimal scalp comfort 
  • Key Technology 3: Low Dose MEA – slightly opens the cuticle for optimal color penetration 
  • Shade Description: Brown / Intense Brown – rich, natural brown with true-to-color undertones
  • Formula Features: Odorless, non-drip, wax-free, fluid texture for easier application 
  • Primary Function: Provide permanent, ammonia-free brown color with up to 100% grey coverage and up to 3 levels lift
  • Application: Mix 1:1 with iNOA Oil Developer, apply to dry, unwashed hair, process 35 minutes, emulsify, rinse

3. PHYSICAL ATTRIBUTES

  • Product Form: Cream hair color / Fluid formula
  • Texture: Smooth, creamy, fluid, non-drip, easy to mix and apply ; wax-free for easier application
  • Color: 4 Brown / Intense Natural Brown
  • Consistency: Smooth, spreadable cream, no-drip
  • Scent: Odorless (ammonia-free) 
  • Finish: High-shine, glossy, natural brown, up to 48% more shine 
  • Packaging: Tube (60g) with sustainable packaging
  • Product Dimensions: 60g / 2.1 oz 

4. HOW TO USE

For Professional Use Only:
This product must be used by a qualified hair professional. Do not use at home .
Preparation:
  1. Wear suitable disposable gloves during the entire mixing, application, and rinsing process 
  2. Use a non-metallic bowl and brush for mixing
  3. Do not use on persons under 16 years of age
  4. Perform a patch test 48 hours before each coloring service
Developer Selection:
Developer Volume
Lift Level
Best For
10-vol (3%)
Up to 1 level
Gentle lift, toning, subtle shifts
20-vol (6%)
Up to 2 levels
Grey/white coverage, natural enhancement 
30-vol (9%)
Up to 3 levels
Visible color changes, maximum lift 
Mixing:
  • Measure 60g (1 tube) of iNOA 4 Brown into a non-metallic bowl
  • Add 60g of iNOA Oil Developer at the chosen volume
  • Mix thoroughly until a smooth, creamy, homogeneous texture is obtained 
  • Mixing ratio: 1:1 (60g color to 60g developer)
  • When a shaker is used, open immediately after mixing to avoid the shaker bursting and the product overflowing
White Hair Coverage Guidelines :
  • Up to 70% white hair: Use target shade alone with 20 or 30 volume developer
  • 70-100% white hair for cool coverage: Mix ½ target shade with ½ Natural shade at the same level
  • 70-100% white hair for warm coverage: Mix ½ target shade with ½ Gold Natural shade at the same level
  • For deeper/opaque coverage: Mix ½ target shade with ½ Extra Coverage Natural shade at the same level
Application:
  1. For pre-lightened hair, mist Metal Detox Pre-Treatment Spray on each hair section before applying 
  2. Apply to dry, unwashed hair
  3. Apply to the root area first, then to lengths and ends as needed
  4. Ensure even saturation from roots to ends
  5. Due to its specific texture, the product requires being pressed against the scalp during application
Development:
  • Processing time: 35 minutes at room temperature 
  • Do not add water during processing
  • Development time starts at the end of the root's application
Rinse and Finish:
  1. After the development time, gently emulsify by adding a small amount of lukewarm water
  2. Rinse thoroughly until water runs clear
  3. Shampoo once with iNOA Post-Color Shampoo and once with Metal Detox Shampoo 
  4. Follow with Metal Detox Mask for optimal results 
Pro Tips:
  • Do not use on hair colored with henna or metallic salts
  • Wait at least 2 weeks after a perm, straightening, or smoothing treatment before applying
  • Avoid letting the product drip onto the scalp or skin; rinse thoroughly and abundantly if contact occurs
  • The product must be used with an appropriate developer
  • Mix only the amount needed for the current application; do not store leftover mixture
SAFETY HANDLING PRECAUTIONS

1. SAFETY PRECAUTIONS

  • For Professional Use Only: This product is a professional chemical color and must only be used by trained professionals 
  • Hair colorants can cause severe allergic reactions 
  • Patch Test: A patch test is obligatory 48 hours before each use. Even if you or your client have already used coloring products before 
  • Protection: Wear suitable disposable gloves during the preparation, application, and rinsing of the product 
  • Do Not Use If: The client has a rash on the face, sensitive/irritated/damaged scalp, has ever experienced a reaction after coloring their hair, or has ever experienced a reaction to a temporary "black henna" tattoo 
  • Not for Use on: Eyelashes, eyebrows (may cause blindness), or persons under 16 years of age 
  • Temporary "black henna" tattoos may increase the risk of allergy 
  • IGNORING AN ALLERGY CAN BE LIFE-THREATENING 
  • Contains: Phenylenediamines (toluenediamines), resorcinol 
  • Storage: Keep out of reach of children. Store upright in a cool, dry place away from direct light and heat 
  • Compatibility: Use exclusively with iNOA Oil Developer 10, 20, or 30 volumes maximum; do not use with hydrogen peroxide greater than 30 volume (9%) 
  • Do not use metal tools (tweezers, comb, etc.) during coloring 
  • Read and follow the instruction leaflet 

2. FIRST AID MEASURES

  • Eye Contact: If product enters eyes, rinse immediately with plenty of clean, lukewarm water for at least 15 minutes. Remove contact lenses if present and easy to do. If irritation persists, seek medical attention.
  • Skin Contact: If product contacts skin, wash off immediately with soap and water. If irritation or redness develops, seek medical advice.
  • Ingestion: This product is not intended for ingestion. If accidentally swallowed, rinse mouth with water and drink a glass of water. Do not induce vomiting. Seek medical attention immediately.
  • Inhalation: If respiratory discomfort occurs, move to fresh air. Seek medical attention if symptoms persist.
  • Allergic Reaction: Signs may include rash, hives, itching, swelling of the face, lips, tongue, or throat, difficulty breathing, or dizziness. If an allergic reaction is suspected, discontinue use immediately, rinse thoroughly, and seek emergency medical attention.