On 21/03/2019 17:27, harry wrote:
When colliery waste tips caught fire, they burned for years.
The resulting ash was red and used as aggregate for all sorts of things when the tip burned itself out.
Mostly in the 1960's

As yongster we had 2 tips near us that we used to play on.
One was known as the blacky bing and the other as the red bing. (obvious
why) The red bing smoulderd for years until they eventually dismantled
it and used it for building roads that would have been in the 60s 70s.

This was another:
https://www.scotsman.com/news/health...ished-1-987586

And some images of a red bing:
http://www.hiddenglasgow.com/forums/...hp?f=12&t=7251