What you you will need:
- Water
- corn syrup
- Red, blue and green food colouring
- Flour, cornstarch, chocolate syrup or maple syrup
Method:
- Combine one part water with three parts corn syrup, Add drops of red food colouring gradually and mix gently by stirring.
- Continue adding drops until the shade resembles that of real blood (always err on the side of adding less, as it's easier to add more).
- Add a small amount of blue or green food colouring to achieve a more realistic shade. (Arterial blood is bright red, while venous blood is a dark maroon).
Add a thickener.
- Dry thickener. Add sifted flour or corn starch to your mixture, and whisk or stir it gently until smooth.
- If small lumps form, wait about a minute and the lumps will float to the top where you can remove them easily. Note: you can also use glycerine instead.
- Wet thickener. Stir in thick chocolate syrup until the desired consistency (and optimal flavour) is reached.
- Chocolate syrup adds a realistic deep maroon "venomous" colour to the blood.
- You can also use pancake syrup to add a brown tone and make the blood a bit thicker and stickier. Don't use too much!
Adjust your mix. (If it is too pink or orange, add red).
- Use blue cautiously Only add blue when you have at least put 3 teaspoons in and 1 drop of blue and you're confident it is still not dark enough and only add blue slowly
- If it seems to be too purple, you'll have to start again––unfortunately, you cannot fix it just by adding more red.
- If the mix is too transparent, add a little flour.
Let the mixture sit for ten minutes in a warm environment. This will give it some time to thicken and coagulate.
- Note: This recipe yields blood that is very sticky initially. It is good for uses that involve children and possible ingestion, as it's not toxic.
