The first thing I thought of when I read this, particularly when the next item was "Changeants" was a shirt I bought in Melbourne, the main colour of which shimmmered, so to speak, against a dark background. It looked nice, but unfotunately was made out of some kind of revolting synthetic material that made me feel sweaty in about two minutes and stink to high heaven after an hour or so.

I think it was described as "shot" (I mean the colour effect), although that hardly seems appropriate....

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Note added at 29 mins (2006-05-14 00:25:59 GMT)
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"Changeant" is in Duden: "1. Gewebe in [Taftbindung] mit verschiedenfarbigen Kett- und Schlussfäden, das bei Lichteinfall in verschiedenen Farben schillert".

I'm kinda guessing that a "Dunkelfond" is the same thing, but with a dark colour as one of the two.

BTW Duden doesn't have this sense of "Fond", nor Wahrig, but Pons-Collins does: "[Untergrund bei Stoffen] base, background".

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Note added at 31 mins (2006-05-14 00:27:21 GMT)
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PS I don't wear that shirt any more: it cost me a fortune and I wore it once!

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Note added at 37 mins (2006-05-14 00:33:50 GMT)
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PPS I just went and found it. It's 100% polynosic (a material I had previously never heard of). So anyone out there who is prone to sweating, don't buy a polynosic shirt! (BTW: there is a plausible case for the etymology of "polynosic" being that it comes from the Greek for "very sick".)