Funeral & Cemetery

I want a blood vial to wear around my neck. Do i need to add anything to the blood so it doesn’t coagulate? ? Basically I am attempting to create a vial of blood to wear as a necklace. I have found these http://www.perfectmemorials.com/glass-cylinder-silver-chromate-cremation-jewelry-p-1363.html Looking to find out if there is anything i must add [...]