SoColor Sync alkaline formulas are pre-bonded, helping to protect the hair's inner structure color after color*, and pre-matched with our SoColor permanent range for flawless results from root to tip. Ammonia-free demi-permanent color that refreshes, fills and tones in just 20 minutes. Brilliant & Ammonia Free. Refreshes color, Fills and Shades gray hair in just 20 minutes. Vibrant reflections giving a shot of shine from the growth to the endsFormat: 90 ml