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Color Loss to Oxide of nitrogen and sulfur

Unlike sunlight fading does not have a Federal or industry standard, but most experts would agree that AATCC 164 COLORFASTNESS (OXIDES OF NITROGEN) for three cycles, (60 hours) with a rating over  four is acceptable.

The original color of this carpet was rose. Oxides of nitrogen moved along the edges of walls and doorways washing out the color. This picture is linked to the report it came from. To determine this kind of fading, run AATCC 164-1987 test, Colorfastness to Oxides of Nitrogen in the Atmosphere Under High Humilities. The results of this test after two cycles should be '4' or over so as not to be considered a manufacturing defect. Some mills will argue that '3' and above is passing. There is no official standard for this test. See a report where three cycles of this test were declared acceptable. Just Click

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