Ammonia – Free hair color simply means there is a driver called MEA guiding color pigmentation in and out of your hair strand. People are coloring their hair at younger ages and more often in our fast past world. Since a hair strand is a relatively delicate fabric (as is your skin and finger nails.) I believe, along with many other colorists, it is best to use the least amount of ammonia on your hair for the best long term quality of your hair.