The present invention relates to a colour transfer-inhibiting material consisting of a cellulose substrate functionalised with a quaternary ammonium compound, and is characterised in that the substrate consists of cellulose particles or of cellulose nanofibres obtained by electrospinning. Said material presents high colour transfer-inhibiting capability, thus being of use when employed as an additive in the laundering of clothing. It also relates to a procedure for the preparation of said material and to a compound for the laundering of clothing which incorporates the same as a colour protector.