Stinking purple stuff above the Celtic Training Ground. 2/4/13
It looks to be what is left after burning a large amount of plastic, such as the type farmers use to wrap their silage bales in. When it burns, it gives off an acrid toxic smoke and there is a liquid discharge as it melts - when this discharge cools it looks like this.
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Photo taken in East Dunbartonshire, UK
Misplaced? Suggest new location