L’ORÉAL PROFESSIONNEL DIA LIGHT 8.34 LIGHT GOLDEN COPPER BLONDE

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L’Oréal Professionnel Dia Light 8.34 Light Golden Copper Blonde is an acidic demi-permanent gloss color specifically formulated to tone, refresh, and enhance color-treated or sensitized hair without ammonia or lift . This innovative formula features Gentle Acid Technology that provides ultimate condition, luminous color, and vinyl shine, leaving hair 30% more conditioned while delivering a glossy, natural-looking finish . The 8.34 Light Golden Copper Blonde shade delivers a bright, luminous result with warm golden and copper reflects, also referenced as 8.34/8GC (Gold Copper), perfect for adding sun-kissed warmth and dimension to blonde hair .
Ideal for toning highlights and balayage, glossing services, refreshing faded color, and corrective color applications, Dia Light offers versatile service opportunities for professional stylists . The ammonia-free formula does not lift hair color, focusing instead on toning, glossing, and refreshing with natural results.
The milky cream texture ensures precision application and even color distribution . Mix at a 1:1.5 ratio with DIActivateur 6-vol (1.8%) for soft deposit on blondes, 9-vol (2.7%) for standard tone-on-tone results, or 15-vol (4.5%) for stronger opacity . Development time ranges from 2 to 20 minutes depending on desired intensity.
This product is intended for professional use only . To use, mix 1 tube (50-60ml) of Dia Light 8.34 with 75-90ml of DIActivateur Developer at the desired volume, apply to dry, unwashed hair using sectioning techniques, process for 5-20 minutes, then emulsify, rinse thoroughly, and follow with a post-color shampoo. Always perform a patch test 48 hours before any coloring service.
Description

Table of Contents

L’ORÉAL PROFESSIONNEL DIA LIGHT 8.34 LIGHT GOLDEN COPPER BLONDE

PRIMARY USES

1. Acidic Demi-Permanent Gloss Color for Warm Tonal Refinement
  • What it does: Dia Light 8.34 is an acidic demi-permanent gloss color formulated with Gentle Acid Technology, designed to tone, refresh, and add gloss to color-treated or sensitized hair without ammonia . The 8.34 Light Golden Copper Blonde shade delivers a bright, luminous blonde with gold and copper tone cues, creating a warm, light-catching finish ideal for light-reflective tonal refinement .
  • How it helps your hair: For the person who wants to add warm golden-copper reflects to their blonde hair, this provides a gentle, low-risk option that enhances natural beauty. For anyone seeking to neutralize unwanted dullness while adding luminosity, this means an ammonia-free formula that respects the hair’s integrity.
2.Enriched with Gentle Acid Technology for Ultimate Condition
  • What it does: The formula features new acid technology that provides ultimate condition, luminous color, and vinyl shine, leaving hair 30% more conditioned . The acidic pH helps seal the cuticle, preserving cortex integrity and promoting healthier-looking hair with enhanced shine and smoothness.
  • How it helps your hair: For the person whose hair feels dry or damaged from previous coloring services, this provides a gentle coloring experience that improves hair condition. For anyone who wants their color service to nourish rather than compromise their hair, this means a formula that conditions and strengthens while it colors.
3. Light Golden Copper Blonde Shade
  • What it does: Shade 8.34 is a Light Golden Copper Blonde that delivers a bright, warm result with gold and copper tone direction . The “8.34” code indicates a Level 8 Light Blonde base with golden (3) and copper (4) reflects, creating a luminous, sun-kissed finish that adds warmth and dimension to blonde hair. This shade is also referenced as 8.34/8GC (Gold Copper) .
  • How it helps your hair: For the person wanting a bright, warm blonde with subtle golden-copper warmth, this provides a beautiful, light-catching finish. For anyone who wants their blonde to look fresh and radiant with a sun-kissed glow, this means a perfectly balanced golden-copper shade.
4. Ideal for Toning, Glossing, and Color Refresh
  • What it does: Dia Light is a 3-in-1 professional tool specifically designed for three key services: Hyaluronic Glossing adds shine and manageability; Hyaluronic Toning neutralizes unwanted undertones after lightening or balayage; and Hyaluronic Refreshing revives faded color on lengths and ends . The versatile formula allows stylists to customize results based on client needs, from subtle highlights to visible changes.
  • How it helps your hair: For the person who has just had highlights or balayage and wants a warm, golden-copper finish, this provides the perfect toning solution. For anyone wanting to add shine and dimension to their color between salon visits, this means a versatile product that adapts to your specific needs.
5. Mixable with 6, 9, or 15 Volume Developer for Customized Opacity
  • What it does: Dia Light mixes at a 1:1.5 ratio (1 tube color to 1.5 parts developer) with DIActivateur 6-vol (1.8%), 9-vol (2.7%), or 15-vol (4.5%) depending on desired intensity . The 6-volume developer provides soft color deposit for natural, more transparent results; 9-volume delivers standard tone-on-tone results; and 15-volume offers stronger deposit for maximum color revelation. Development time ranges from 2 to 20 minutes depending on desired outcome.
  • How it helps your hair: For the stylist, this provides the flexibility to customize the opacity and intensity based on client needs. For the client, it means a tailored service that can range from a subtle gloss to a more noticeable color refresh.
6. Milky Cream Texture for Precision Application
  • What it does: The formula features a milky cream texture that feels more like a treatment than a color, allowing for precision application and even color distribution . The gel-cream consistency ensures easy mixing, application, and rinsing.
  • How it helps your hair: For the stylist performing precise color work, this provides a manageable, non-drip formula that enables clean, professional application. For the client, the creamy consistency ensures even coverage and predictable results with minimal mess.

SECONDARY USES

1. Toning After Lightening Services: Apply to pre-lightened or bleached hair to neutralize unwanted yellow or brassy undertones while adding warm golden-copper reflects using 6 or 9 volume developer, processing for up to 20 minutes. For the person who has just had highlights or balayage and wants a warm, luminous finish with golden-copper tones, this provides the perfect toning solution.
2. Glossing Service: Apply to all-over hair for 5-20 minutes to add intense shine, improve manageability, and deposit subtle color reflection without altering the base shade. For the person who wants a “gloss” service between color appointments, this provides a quick, low-commitment shine boost.
3. Refreshing Faded Lengths and Ends: Apply specifically to mid-lengths and ends after a permanent color root touch-up to revive faded golden-copper color and ensure a seamless match, using 9 or 15 volume developer. For the person whose warm blonde ends have faded faster than their roots, this provides an even, refreshed result.
4. Corrective Color and Lowlights: Suitable for corrective color applications, pre-coloration, and creating warm lowlights to add dimension to blonde or highlighted hair. For the person wanting to add depth and warmth to their color without a full-color service, this provides a versatile option for dimensional results.
5. Pre-Coloration Treatment: Apply before permanent color to even out porosity and improve color absorption on porous ends. For the person whose color turns out darker on the ends than at the roots, this provides a preparatory step that creates a more uniform canvas.
KEY PRODUCT FEATURES

1. BASIC IDENTIFICATION ATTRIBUTES

  • Brand: L'Oréal Professionnel Paris
  • Product Name: Dia Light 8.34 / Dia Light 8.34 Light Golden Copper Blonde
  • Shade: 8.34 Light Golden Copper Blonde / 8.34/8GC Light Blonde Gold Copper
  • Product Type: Acidic demi-permanent gloss color / Semi-permanent hair color
  • Key Benefits: Conditions sensitized hair, adds shine, neutralizes unwanted undertones, ammonia-free, leaves hair 30% more conditioned
  • Key Technologies: Gentle Acid Technology, Acidic pH technology
  • Formula Integrity: Ammonia-free, up to 92% natural origin ingredients 
  • Volume: 50ml - 60ml
  • Mixing Ratio: 1:1.5 (50-60ml color to 75-90ml developer)
  • Recommended Developers: DIActivateur 6-vol (1.8%), 9-vol (2.7%), or 15-vol (4.5%)
  • Processing Time: 2 to 20 minutes
  • Grey Coverage: Up to 70% 
  • Longevity: Up to 6 weeks of gloss color 
  • Made in: France
  • UPC/EAN: 3474637004361 , 3474637208110 

2. TECHNICAL & FORMULATION PROPERTIES

  • Key Technology 1: Gentle Acid Technology – provides ultimate condition, luminous color, and vinyl shine; acidic pH helps seal the cuticle and promotes healthier-looking hair 
  • Shade Description: Light Golden Copper Blonde – bright light blonde gloss shade with gold and copper tone cues 
  • Proven Results: Leaves hair 30% more conditioned; 3x more shine 
  • Primary Function: Tone, refresh, and add gloss to color-treated or sensitized hair with gentle, ammonia-free formula
  • Application: Mix 1:1.5 with DIActivateur developer, apply to dry, unwashed hair, process 2-20 minutes, emulsify, rinse

3. PHYSICAL ATTRIBUTES

  • Product Form: Cream hair color / Gel-cream
  • Texture: Milky, creamy, smooth gel-cream consistency, feels more like a treatment than a color 
  • Color: 8.34 Light Golden Copper Blonde
  • Consistency: Smooth, spreadable cream
  • Scent: Light professional fragrance
  • Finish: Glossy, shiny, conditioned, smooth, luminous, warm golden-copper
  • Packaging: Tube (50ml-60ml) 

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 protective gloves
  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 by Service Type:
Service Type
Developer Volume
Processing Time
Glossing / Soft deposit (blondes)
6-vol (1.8%)
2-10 minutes
Toning / Standard tone-on-tone
9-vol (2.7%)
10-20 minutes
Grey coverage / Strong deposit
15-vol (4.5%)
15-20 minutes 
Mixing:
  • Mix 1 tube (50-60ml) of Dia Light 8.34 with 75-90ml of DIActivateur Developer
  • Mixing ratio: 1:1.5 (50-60ml color to 75-90ml developer) 
  • Mix thoroughly until a homogeneous, creamy consistency is achieved
  • When using a shaker, open immediately after mixing to prevent pressure buildup
Three Key Service Applications :
  1. Glossing Service: Apply globally to add shine and increase manageability; use 6 or 9 volume developer; process for 2-10 minutes
  2. Toning Service (Patina): Apply to pre-lightened or balayaged hair to neutralize unwanted undertones while adding warm golden-copper reflects; use 9 volume developer; process for up to 20 minutes
  3. Refreshing Service: Apply to lengths and ends to revive faded color after root touch-up; use 9 or 15 volume developer; process for 15-20 minutes
Rinse and Finish:
  1. At the end of the processing time, gently emulsify by adding a small amount of lukewarm water
  2. Rinse thoroughly until water runs clear
  3. Follow with a post-color shampoo (Metal Detox or Vitamino Color Spectrum)
Pro Tips:
  • Do not use metallic tools (bowl, comb) during mixing or application
  • For best results on pre-lightened or bleached hair, use Dia Light to tone immediately after lightening
  • To maintain color vibrancy and shine, recommend clients use Metal Detox or Vitamino Color Spectrum shampoo
  • The color of the mixture will change during development time; this is normal and has no effect on the final color result
  • Always read the package insert before use
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 dyes can cause severe allergic reactions
  • Patch Test: A patch test is obligatory 48 hours before each use. Apply a small amount of color on a sensitive area of skin, such as the inside of the elbow. If after 48 hours no reaction is observed, proceed with the full application 
  • Protection: Wear suitable protective gloves during the entire mixing and application process
  • 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
  • If the product comes into contact with your eyes, wash immediately and thoroughly with water
  • Storage: Keep out of reach of children. Store upright in a cool, dry place away from direct light and heat
  • Do Not Inhale or Swallow: Avoid inhalation and ingestion
  • Mixing: Do not use metal utensils during coloring (bowl, tweezers, combs, etc.)
  • Compatibility: Use exclusively with L'Oréal Professionnel DIActivateur developers (6, 9, or 15 volume)
  • Henna Precaution: Not recommended for use on hair previously treated with henna or progressive color products
  • Post-Chemical Treatment: Wait at least 2 weeks after a perm, straightening, or smoothing treatment before applying

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 your 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.