Corn Syrup Blood
This is the recipe that pretty much everyone uses, and there's a lot of variations so feel free to experiment. 16 oz. White corn syrup (Karo syrup - this is a US product, but adding golden syrup does the job just as well, alternatively just mix sugar and water and reduce on the stove until it becomes syrupy) 1 oz. red food coloring 1 oz. washing detergent 1 oz. water Add a drop of blue food colouring to create a more realistic colour. Remove the washing up liquid if you want to make edible blood. Adding condensed milk makes it less transparent and more like real blood. The blood is extremely sticky and can stain skin and clothes so makes sure its washed off quickly. Use a stain remover on clothes.-
Because of the food colouring used in a lot of blood recipies they tend to stain easily and can sometime look more purple than red. Here's a more natural alternative that's closer to a Spaghetti Western style arterial red. It also washes out of clothes easily and can be eaten reasonably safely (although why you'd want to eat it is beyond me).Take a teaspoon or two of Arrowroot (a white powder used in baking that you can easily find in health food shops) and add to water heated on the stove. Stir continuously until the mixture becomes gloopy. Add a small amount of red children's non-toxic powder paint and stir in. The mixture should now be bright red. Add a tiny amount of brown powder paint or coffee concentrate (make this by adding a small amount of water to coffee granules) to darken the blood as required. Store in a bottle or jam jar and thin by adding water to make the blood the required consistency as and when you need it. For bullet hits you need to thin the blood quite a bit to allow it to spray out.
Lo-Cost Blood Add a few drops of red food colouring to the cheapest washing up liquid you can find. Add a drop of blue colouring or some coffee concentrate to create a more realistic colour. Produces a runny blood that has a slight tendency to foam. Great for those bucket of blood effects on the cheap. Washes off reasonably well but tastes foul if you accidently get it in your mouth.
Cherry Red Mix 1 cup water and 1 tablespoon flour. Bring to a boil and let boil for 3 min. Then let simmer on low for 15 min. Remove from heat and let stand around 5 min then mix in one 0.13 oz. package of black cherry (powder) kool aid mix. You will see the results right away. When I priced one packet of kool aid to the food coloring it was about a quarter of the price.It is a little thick but a good color. Another cool part is if you do get some in your mouth or have to drink it as for a vampire movie, it tastes pretty good too.
Black and White blood Alfred Hitchcock famously used Bosco chocolate syrup in Psycho. Any opaque chocolate syrup will do. Tastes great as well!
Jelly Blood Microwave 3-4 bottles of glycerin then add one cube of strawberry jelly and mix until dissolved. Then add small amount of gelatine (1/5 of a packet) and then add red food colouring to desired effect. Keep stirring until mixed well. It is sligtly runny but great for that reservoir dogs look in back seat of the car. All ingredients are easily found in supermarkets.