safe liquids to use for 'pink eye' video?

[cheeky_chappie]

Originally Posted by gonzo

Private collectors are usually nuts with their requirements. But if you can get htem to pay then good luck!

don't think there'll be a prob getting paid, i know the guy, he's basically housebound otherwise he says he'd shoot these himself yeah the requirements are pretty extreme but if i know things are safe enough for the model i'm happy enough to go ahead, things like food colouring (suggested above) might be ideal, it has to be 'real' so no faking allowed having said that i need to find the safest way to achieve the bloodshot eyes