About This Hair Dye Shade
Garnier Olia hair dye shade 4.0, "Dark Brown," is a natural dark brown one shade lighter than 3.0 Darkest Brown. It also provides 100% gray coverage.

Is This Shade Right For Me?
Shade 4.0 hair dye is best for anyone with natural hair between light brown and black. If you prefer a lighter color that still reflects naturally, try shade 5.0 Medium Brown. If you would like to remain in the dark brown range but want to explore other reflects and tones, there are many shades to choose from including 4.11 Dark Platinum Brown.

For those who currently have color treated hair, there are special considerations for the color result you can achieve. Use our Shade Selector Tool to find the shade for you!

About Olia
Unlike traditional hair dye, Olia uses a 60% oil blend with no ammonia natural flower oils to achieve brilliant, radiant color results. The oil powered technology propels colorants deep into the hair, giving you vivid, long-lasting color. Olia visibly improves and restores hair as the oils help to reverse roughness and dullness for more brilliant, long-lasting color. Olia-treated hair is hydrated, silky and up to 3X shinier than unwashed, uncolored hair.

Shade Description:
4.0 Dark Brown is a natural, neutral dark brunette tone. This rich shade provides a balanced, deep brown without brassiness, delivering vivid, long-lasting color and exceptional shine.

• Ammonia-free, oil-powered formula: 60% oil blend helps propel color deep into the hair fiber for high-impact, even color without strong odor.
• Up to 100% gray coverage, including resistant grays.
• Neutral dark brunette tone helps minimize brassiness and red/ashy shift.
• Up to 3X more shine vs. uncolored, unwashed hair.
• Post-color softness: after-color conditioner leaves hair feeling smooth and nourished.

In shade mapping, 4.0 = Dark Brown (neutral—not specifically ash- or red-leaning), which is ideal if your current hair is light brown to black and you want a natural-looking dark brunette.

The kit includes everything you need:
• Colorant cream (tube): deposits the 4.0 Dark Brown shade.
• Developer (applicator bottle): activates color for long-lasting results.
• After Color Conditioner: seals in color, adds softness and shine.
• Gloves + no-drip cream texture: easy, even at-home application.

Packaging Details
• This product comes as a complete hair coloring kit, packaged in a corrugated board box.
• Size: 1 Piece.
• Product Dimensions: 6.5 in x 3.5 in x 2.7 in.
• Product Form: Hair Coloring Kit.

Before you color: Always do a skin allergy test 48 hours before each use. Wear gloves and protect your clothing.

Preparation: Apply to dry, unwashed hair. Mix colorant into the developer bottle as directed; shake until fully blended.

Application: First-time users should saturate roots through ends. For root touch-up, apply to regrowth first, then pull through lengths.

Timing: Process for 30 minutes, but for resistant grays, extend up to 40 minutes per kit directions.

Rinse & Care: Rinse until water runs clear, then apply the After Color Conditioner and leave on as directed. Maintain color with color-safe shampoo/conditioner and plan root touch-ups every 4–6 weeks.