Wella Koleston Perfect 66/0 Intense Dark Blonde/Natural is part of the Pure Naturals Intense series, giving you a more saturated, longer-lasting version of classic 6/0 dark blonde.
What it is
Shade: 66/0 (Intense Dark Blonde / Natural)
Type: Permanent creme hair color (2 oz)
Tone family: Neutral with enhanced pigment density
Level: Dark blonde with deeper, richer saturation
Key features
Up to 100% gray coverage with strong, even results
ME+ technology → helps reduce risk of developing new dye allergies while maintaining performance
Metal Purifier technology → helps protect hair from damage caused by metal buildup
True-to-tone, balanced color with natural depth and shine
Richer pigment payoff vs standard 6/0 for longer-lasting results
How pros use 66/0
This is your “boosted dark blonde”:
Stronger gray coverage than 6/0
Creating richer, deeper dark blonde results
Ideal for coarse or resistant hair
Enhancing formulas when you want more saturation + longevity
Formulation basics
Mixing ratio: 1:1 with Welloxon developer
Developer choice:
10 Vol → deposit + deeper tone
20 Vol → gray coverage + slight lift
Lift: Minimal (deposit-focused with some lift depending on developer)
Pro insight
66/0 is essentially 6/0 turned up:
Same neutral dark blonde base, but heavier pigment load
Better grip on stubborn gray hair
Gives a richer, more dimensional dark blonde vs softer 6/0
Quick shade comparison
5/0 → light brown (deeper, warmer)
6/0 → standard dark blonde (soft + natural)
66/0 → intense dark blonde (richer + more saturated)
