A hair dyeing agent, a combination of the hair dyeing agent and a softener for dyeing hair and the method of using the combination are disclosed. The hair dyeing agent comprises a dye active, a mordant active, a stabilizer, water, and a carrier and/or an excipient. The dye active is selected from gallic acids, salts and esters thereof and their combinations. The mordant active is a ferrous salt selected from ferrous sulfate, ferrous chloride, ferrous nitrate, ferrous gluconate, ferrous lactate and ferrous fumarate.
