A Blue-Rinse is a very light blue
hair dye popular among the over 50s. The main reason for this
peculiar choice in hairstyle is the deteriation of the
human eye with age.
As the eye gets older, the lens begins to take on a yellowish colouring. This happens so gradually, that the
old codgers don't even notice that they are now seeing the world in a slightly yellower part of the
electromagnetic spectrum than they once were.
Consequently, by dying their hair
blue, they can achieve a very
distinguished grey look before their peers.