They're having a giraffe. It would be hygenically impossible to use real blood. Where would they get it from and what would they use to stop it from going off?
They've probably used theatrical blood or just a transluscent red makeup
Although speaking as someone who spends their Sunday afternoons making the stuff in her kitchen, it's easy as pie to do yourself with kitchen contents (and then some) according to what you're using it for. Splatters, flooding and spraying blood have to be almost water, Blood that's "been there for a while" has to be a lot thicker, usually with a gelling agent like geletine, or a thickener like (surprisingly) cornflour. If it's for a wound it has to be sticky in order to stay put, and if it's going near the face/in the mouth it has to be non-toxic and probably taste nice. This is just Golden Syrup with a few bottles of red food colouring in and a tiny bit of green. Then you have to get the colour right, oxygenated blood is bright red, whereas de-oxygenated blood is more of a purply red. Blackberry compot is excellent for scummy puking blood...
errrahem, I've gone off on a tangent. No, they do not use real blood. Don't believe everything Kerrang tells yoooooooou...!
