What is the most uncommon hair colour?

Natural red hair is the least common hair colour, occurring in only 1-2% of the world's population.

Red hair is caused by a mutation in the MC1R gene, which is responsible for producing melanin. This mutation results in the production of a different type of melanin called pheomelanin, which gives red hair its characteristic colour.

Red hair is most common in people of Northern European descent, particularly in Scotland, Ireland, and Wales. It is also found in some parts of Asia, such as China and Japan.

Red hair has often been associated with certain personality traits, such as being passionate, fiery, and creative. However, there is no scientific evidence to support these claims.