Five disperse reactive dyes applied on drawn and undrawn samples of nylon in both the fixed and unfixed state have been examined for their lightfasthess on the Fade-Ometer. Higher lightfastness on drawn nylon shows that these dyes are probably in a state of very low aggregation, and also this higher lightfastness can be attributed to the "diffusion- restriction" (DR) effect. The fact that fixed dyeings are not found to be faster than the unfixed ones tends to show that the dye-fiber bond obtained in reactive type of dyeing does not seem to contribute to higher lightfastness.
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