The invention relates to a composition for dyeing keratin fibres, comprising i) at least % and preferably at least 5% of red henna (Lawsonia inermis, alba) powder and/or of powder of indigo-producing plant(s), ii) at least one oil, iii) optionally at least one surfactant, and iv) water or an aqueous phase, preferably water, it being understood that the ingredients 10 ii), iii) and iv) are predispersed together to form a predispersion and the ingredient(s) i) are then mixed into the said predispersion or the said predispersion is mixed with the ingredient(s) i)； the invention also relates to a composition comprising the said composition and a supplement of water or of aqueousphase, the process for dyeing keratin fibres using the said compositions, and to the use of the said compositions for dyeing keratin fibres.1 The compositions and the poultice according to the invention make it possible to dye keratin fibres with strong, chromatic dyeing results that are resistant to washing, perspiration, sebum and light, and that are moreover long-lasting, without impairing the said fibres. Furthermore, the use of the compositions or of the poultice does not give off any raw material 20 dust (dust-free). These compositions are easy to use, in total safety and with no risk of staining. In addition, the composition and the dyeing active agent(s) remain stable on storage. The treated keratin fibres have a very pleasant cosmetic aspect, their integrity is respected.L'invention concerne une composition pour colorer des fibres de kératine, comprenant i) au moins % et, de préférence, au moins 5 % de poudre de henné rouge (Lawsonia inermis, alba) et/ou de poudre de plante(s) produisant de l'indigo, ii) au moins une huile, iii) facultativement, au moins un agent tensio-actif, et iv) de l'eau ou une phase aqueuse, de préférence de l'eau, il est entendu que les ingrédients 10 ii), iii) et iv) sont prédispersés ensemble pour former une prédispersion, et le ou les ingrédients i) sont ensuit
