A method of colouring or coating a plurality of individual fibres 10 comprises: (a) applying a formulation comprising (i) water and optional emulsifier； (ii) a condensation-curable film-forming amino-silicone pre-polymer 12, and (iii) a cross-linking agent 14, and optional catalyst 16, for curing the pre-polymer； (b) effecting partial condensation curing of the pre-polymer on the external surface of the fibres； (c) subsequently washing the fibres with a rinsing liquid to produce a washed silicone film； and (d) applying an aqueous dispersion containing a polymeric material having neutralized acid moieties and at least one surfactant, to produce a polymeric film that coats the silicone film. Preferably the neutralized acid is a neutralized ethylene-acrylic acid (EAA) copolymer, in which at least one pigment is embedded. Also disclosed is a plurality of fibres, each comprising: (a) a core fibre； (b) an at least partially cured amino-silicone film enveloping and adhering to the core fibre； and (c) a coating including a polymer film having neutralized acid moieties, at least partially enveloping the partially cured amino-silicone film. A method of removing a film of EAA neutralized copolymer linked to a cured amino-silicone film is also disclosed.La présente invention concerne un procédé de production d'un revêtement sur une surface externe de fibres capillaires de mammifère individuelles, le procédé comprenant (a) l'application sur la surface externe des fibres individuelles, d'une émulsion huile dans eau comprenant un prépolymère formant un film d'amino-silicone, de façon à former un film d'amino-silicone au moins partiellement durci ； et (b) l'application d'une dispersion aqueuse sur ledit film d'amino-silicone, pour produire un film de polymère sus-jacent, facultativement pigmenté, qui recouvre ledit film d'amino-silicone au moins partiellement durci ； la dispersion aqueuse contenant : (i) un matériau polymère comportant des fragments acides neutralisés ； et facultat
