A study has been made of the in service fading of a numher of blue anthraquinone dyes on nylon carpot yarns before and after heat setting. Samples were exposed to indoor and outdoor atmospheres in various parts of the U. S. A. The importance of the atmospheric humidity and temperature in the fading, suggested by laboratory testing, was confirmed. The laboratory test was shown to rank dye/fiber combinations in order of resistance to fading, and such a ranking was reproduced in the fading of samples exposed outside the houses. Inside the houses the laboratory ranking was less accu rate, illustrating the difficulties of using laboratory tests to predict the service life of a dyed nylon carpet.
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