Wella Koleston Perfect 4/0 Medium Brown/Natural is a core neutral brunette shade from the Pure Naturals family—designed for true-to-tone, balanced medium brown results without excess warmth or ash.

What it is

• Shade: 4/0 (Medium Brown / Natural)
• Type: Permanent creme hair color (2 oz)
• Tone family: Neutral / Natural
• Level: Classic medium brown

Key features

• Up to 100% gray coverage for even, natural-looking results
• ME+ dye technology → helps reduce risk of developing new dye allergies while maintaining performance
• Metal Purifier technology → helps protect hair from metal-induced damage
• True-to-tone, balanced color with natural depth and shine
• Professional cream formula for smooth, controlled application

How pros use 4/0

• Go-to medium brunette for natural-looking color
• Gray coverage clients who want a soft, balanced finish
• Root touch-ups for levels 4–5
• Base shade for dimension (lowlights/highlights)

Formulation basics

• Mixing ratio: 1:1 with Welloxon developer
• Developer choice:
  • 10 Vol → deposit only / deeper result
  • 20 Vol → gray coverage + slight lift
• Lift: Minimal (primarily deposit-focused)

Pro insight

4/0 is your “everyday brunette”:

• More versatile and wearable than darker shades like 2/0 or 3/0
• Sits right in the middle—not too dark, not too light
• Ideal for clients who want natural dimension and softness

Quick shade comparison

• 3/0 → deeper dark brown
• 4/0 → classic medium brown (most balanced)
• 5/0 → lighter, softer brown