A range of basic dyes and an acidic dye have been dyed onto wool at room temperature using dimethyl sulfoxide as the solvent. When fluorescent Rhodamine dyes are dyed to low depths of shade by this method, the lightfastness of the dyeings is enhanced compared with wool dyed conventionally. There are two possible explanations for this enhanced lightfastness: (1) the dye is aggregated in the fiber when dyed from dimethyl sulfoxide, or (2) dimethyl sulfoxide directs the dye to different sites in which the dye is more stable to light.
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