I have Masters degree with Distinction and Student of the Year Prize in Corrosion of Engineering Materials from Imperial College London, first degree in Chemistry from University of Central Lancashire and also did Technology, Material Science and Engineering and Mathematics from the Open University.
In areas where tattooing is not as closely monitored, people are asked to wait for 12 months to give blood after getting a tattoo. This waiting period ensures that the donor is free of any potential blood-borne diseases which could have been passed on unsanitary equipment.
You will have some time to relax while the bag is filling. (For a whole blood donation, it is about 8-10 minutes. If you are donating platelets, red cells or plasma by apheresis the collection can take up to 2 hours.). When approximately a pint of blood has been collected, the donation is complete and a staff person will place a bandage on your arm.