L’Oréal has developed a novel hair dye formula that works just as well as traditional hair dye, but without the ammonia odor associated with those formulas. New INOA (Innovation No Ammonia) relies on a chemical called monoethanolamine, or MEA, which has no odor. MEA is alkaline (as opposed to acidic), like ammonia, so it can accomplish the first step in permanent hair dye, which is to open the hair’s cuticles. In fact, L’Oréal already sells ammonia-free permanent hair dyes that c...