| I usually find that off the shelf stage blood
works pretty well. Generally washes out okay, and is non toxic.
Try various theatrical supply / fx houses. A quick search on
the web should turn up plenty of vendors. I think most are glycerin
based.
I have also made my own using a mixture of glycerin or karo
syrup and pink dish soap colored with red and blue food color.
The secret to my recipe is a little bit of smooth peanut butter
in the mix... makes it look like opaque blood, not cherry
pie filling. If you want bone chunks (eeeeew!) use chunky
style peanut butter.
I once saw a really cool effect where someone used bronzing
powder in glycerin concealed in latex appliances on some dancers
arms and legs. They pulled hat pins out of their hair, and
punctured their bodies, bleeding metallic gold while they
danced. Trippy!
The oil in the peanut butter, sugars in the karo / glycerin,
and dyes are all horrible for washing out of fabrics. Definitely
test your blood recipe on scraps of the costume first! The
dish soap helps keep the stains from setting, but is bad if
it gets in the eyes / mouth. (Why do they always want the
person in all white clothing to get horribly bloody! Why!)
Also, beware of ants when using anything sugary. I actually
saw an entire stage floor
crawling with ants after a bloody show once... yecchh...
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