nylon carpet fibers are provided which resist staining by acid dye colorants at room temperature , yet are dyeable at elevated temperatures with acid dyes without losing their resistance to acid dye colorants at room temperature . the fibers are characterized by having a coating on the surface thereof comprising one or more selected compounds . carpets comprising the fibers resist staining when exposed for long periods of time to spills containing acid dye colorants . by also including a fluorochemical in the coating , the carpets can resist such staining even after being subjected to heavy human trafficking .