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.
Fact: The time taken for a single donation session is normally not more than an hour or so. Myth: There is limited blood in the body and it is unhealthy to give some away. Fact: Only about 350-450ml of blood is taken during a donation session. There is enough blood in the body to donate it without any ill effects.