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.
How long does it take to give blood? The donation process includes registration, a brief medical screening, blood collection, and time for refreshments in the Canteen. For whole blood the entire donation process usually takes about one hour and the actual blood collection segment is usually about 15 minutes.