Clear corn syrup (Karo is one brand name)
Water
Red food color
Blue food color

Do several tests to find out the mixture you like best - it usually takes only a drop or two of blue per quart. I use black coffee rather than water to thin the syrup and make it more opaque.

Add a little photoflo (from Kodak) so it doesn't bead up as much. But not if you're using it in an actors mouth! Add a little liquid dish washing soap to make it stain less.

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The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)

?url? http://nigel101.proboards39.com/index.cgi?board=LowBudget&action=display&thread=1114540317?/url?

go here a list on how to make different bloods.

This might sound strange....my partner is a scientist in a pathology. She says that she can get real blood (from the pathology blood bank).
The blood they have is clean, so there is no risk of contamination.
No Bull S*%!!

Like many things on a movie set, the real thing isn't always the best.

Real blood, being organic, will decompose quickly and begin to smell. Corn syrup based "blood" will not. Being a fairly good director, I may be able to persuade people to do a lot of things "for the movie", but I doubt I could convince an actor to hold real blood in his mouth no matter how safe.

But hey, if you want to use the real blood your friend can get...

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The aim of an argument or discussion should not be victory, but progress.
Joseph Joubert, essayist (1754-1824)

Corn syrup, is the best way to go, with red and a hint of blue food coloring
you can do so much with this
also my friend is a theater production dude and he says if you can put in a hint of baking soda (or flour) for some lumpy ness, this will give you a good thick gory effect