People living near a river in Oxfordshire were rather surprised to find that it was a rather bright shade of green today. The Environment agency were called to Grove Brook near Wantage to find it was fluorescent green. It is thought that the colour was caused by a dye that is used to trace the flow of water through drainage systems, but it is not known how the dye got into the river. The dye, however is not toxic and should disperse by the end of the day. I wonder if it turns the fish green as well.