Yes, primarily the formulation does not use Ammonia (Ammonium Hydroxide) and Ethanolamines (including mono-ethanolamine or MEA, diethanolamine or DEA) as alkaline agents.
At Kasia Salon, phone calls come in daily of a growing number of reactive/allergic coloring guests. It's "no wonder...." Ammonia is a strong irritant to skin and the respiratory system, while added ethanolamines which is a milder irritant is also a known toxicant to internal organs and a carcinogen. Source: CosmeticsDatabase.com