What is Rh null? One of the rarest blood types on Earth. Sorry AB-negative; you’re not the only rare blood type in the world. First discovered in an Aboriginal Australian woman in 1961, the Rhnull (Rhesus null) is one of the rarest and most precious blood types in the world. … and why is it called “Golden Blood”? The rarest blood type in existence is Rhnull blood. This stuff is characterized by a complete lack of antigens in the Rh system, which is the largest blood group system. This includes the D antigen (Rh factor, baby), plus the other 50-something antigens in the group. Who is “The Man with the Golden Arm” James Harrison? Due to his age, James Harrison was forced to finally retire from donating blood plasma. Rhnull phenotype is a rare blood … Continue reading Golden Blood: Rh Null