How to collect blood

We think pricking the finger would be the easiest way to do this, similar to tests for diabetes.

This is a very simple method, which only requires a small amount of blood, just for the pigment of the ring. We did not test this due to health and safety, but we collected blood from a butcher.

These are samples we took from blood, urine and tears. We attempted to grow crystals in each of these, as they both contain salt. However, we added more salt, which we realised we didn't need to do because it was not really the concept of our work, as we want to use the salt form our own minerals.
The blood did not successfully grow crystals.