The term refers to the Blue bloods year 2010 2020 10 seasons 218 episodes shirt European royal aristocracy and is a metaphor describing the deep blue appearance of veins and skin. The term Blue Blood (also known as sangre azul) originated possibly before recorded history. Very certain a number of factors may have created this term. Since Karl Landsteiner discovered blood type in 1901, since then more than 30 groups have been added with more than 600 blood type antigens. It seems that the antigen found in European.
Royal families has less distribution .1%. Rh blood can contain elevated copper levels when compared to all other blood types. This increased copper content may allow for a more blue pronunciation with the Blue bloods year 2010 2020 10 seasons 218 episodes shirt appearance of blood while in a vein. Royal illnesses, high incidence of Hemophilia in Royal families can also be attributed to breeding selection and high blood levels. Silver has one of the strongest antibacterial properties of any naturally occurring substance. Silver was a very clear way to depict the wealth of royal families and used it for many common items.