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.

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