Apparently the dye used to give it the blue colour has not passed health and safety tests in the UK. Something about if it gets in the water system. Saying that you will have to find a hard nosed tester to fail it I guess
Are all DOT 4 fluids basically the same as long as they comply with the relevant SAE standard, branded just means they can charge more, l mean TESCO petrol is picked up from the same place as BP petrol!