Abstract
The presence of relatively large particles of a vat dye in nylon has been found to give outstanding lightfastness. Nylon colored with large particles of "Ponsol" Red BN required exposures in the Fade-Ometer of more than 200 hrs. in order to obtain perceptible change in color. Ordinary dyeing procedures, in which extremely small particles of dye are deposited in the nylon fiber, lead to Fade-Ometer-fastness for this color of less than 10 hrs. There are indications that this phenomenon is characteristic of many members of the vat color class.
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