I know that I am O and had a blue blood donor card to prove it, my father too. My mother was given two different cards by her GP many years ago whatever she had been told before she was then given a yellow card, what blood group would that be? Been looking on the internet but cannot find anything to assist me. Thanks.
In the days when blood donors all had a booklet into which stamps were placed to record donations all the cards were blue irrespective of blood group.On reaching 50 donations along with the Gold award badge you were given a gold booklet so everybody could see at a glance that you'd made a minimum of 50 donations.
On the bags, O were blue, A were yellow, B were pink, AB were black and white. As has been stated the donor books were all blue with a 'page' stuck in for every donation.