The present invention relates to a dyeing method using a composition including at least one dyeing precursor obtained from one or more non glycosylated iridoids of formula (I) and at least one chemical oxidising agent a composition including at least one dyeing precursor a device including said precursors the dyeing precursors and a method for preparing said precursors. The dyeing method and composition according to the invention make it possible to obtain a variety of dyes which do not damage hair and are particularly resistant to shampoo.
