Aveda Full Spectrum Demi + Custom-Deposit Treatment Hair Color B Light Intense Ash is 93% naturally derived. Full Spectrum Demi + is a conditioning blend of certified organic plant oils, including kukui, sunflower, castor, and jojoba, which helps improve the condition of even damaged hair and provides radiant shine, and results last up to eight weeks or 40 washes. All this is possible with a new gel formula that drives into hair and penetrates without the use of ammonia.