How to make fake blood

One of our main characters was stabbed and bleeds severely during the opening scene. As he crawls to the door or is dragged around by the woman, he leaves a bloody path on the floor and multiple stains on the nearby objects. So we need to learn how to make washable, realistically looking blood and how to achieve the visual effect of heavy bleeding. Here is a suitable recipe:

Ingredients

1. Washable red tempera paint
2. Washable red tempera paint
3. Washable brown tempera paint (optional)
4. Water

Instructions

1. Pour as much paint into the container that you think you will need
2. Add about 1/4 as much water as the red paint and mix. If it is too runny it will look unrealistic.
3.Slowly add blue and/or brown paint a little bit at a time and mix
4. As soon as it turned dark enough you're finished

For our scene we will need a combination of dark and bright red, since the man is covered in both fresh and dried up blood, which are different in colour.

The recipe is taken from an article on eBay web-site: "The Only 3 Fake Blood Recipes You'll Ever Need"

This video from Rocketjump Filmschool Youtube channel tells the history of the use of fake blood and shows the process of making it in more detail.