Why is my broad bean- blanching water PINK?

I blanched a kg of broad beans today and left the pot of water on the stove as I carried on. I later peeked in to see that the water was a beautiful pink?! Probably some sort of scientific answer? Or maybe I'm just going mental and seeing things?

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Helen's A. July 11, 2011
I'm not sure why, either, but had the same thing happen last week. Now I'm curious, too!
 
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