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Wales Online
Wales Online
National
Bethany Gavaghan

Cardiff woodland stream turned fluorescent blue

Cardiff Natural Resources Wales

A woodland stream in Cardiff that turned into a bright blue colour was caused by a harmless dye used to check the drainage system, Natural Resources Wales has said.

The bright colour of the stream was spotted at Cefn Onn Park, just on the outskirts of Cardiff, and a video was shared by Twitter user David Kilner on Tuesday, January 11. David said in his Twitter post: “Can anyone explain this?

“In a woodland stream north of Cardiff today. I want to hope it's not bad but simply can't believe it…”

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