I have had 2 jobs recently, both involving l/p nylon carpeting and both brown/reddish in colour.
In both cases, one was in a permanent marquee adjoining a venue which had windows along the side where the sun came in, and an area all along that side had turned black, the customer thought was dirt ,I explained pointing out the area it was only where the rays got too.
The second a rented house, bay window bedroom and bay window lounge both facing the sun and area,s that had turned black in identical places of the carpet, again I explained sun damage was the only explanation.
How ever, although I am convinced it was the sun in both cases, can any body explain why the sun turns it black as opposed to fade as in most cases?
geoff