Why is my belly button fluff always coloured blue ? Even when I haven''t had blue clothing on ? | No

Why is my belly button fluff always coloured blue ? Even when I haven't had blue clothing on ?

Paul Chapman, Copenhagen, Denmark

• it is blue as that is the natural colour of the cotton which forms your clothing. the sweat caught in your belly-button helps the blue diffuse from the cotton into the fluff, giving the familiar sight.

  Andrew, Swansea UK

• Also, you may notice that tumble dryer fluff is mainly blue too. I was once told that this is because it's largely composed of human skin. Hmmm.

  Carla, Crewe, UK

• Fungal infections are pretty common in the folds of human skin. Maybe your navel is infested with the same mould that produces stilton cheese.

  Bruce, Bristol, UK

• For more information, you might like to visit Graham Barker's navel fluff page at: http://www.feargod.net/fluff.html

  Liz, Reading, UK

• If you intend to visit a site dedicated to naval fluff, I think the colour of your fluff is the least of your problems.

  Jamie Barking, Jersey

• Simply... The sky is blue. There are more particles of blue in the atmosphere which makes any colour of fluff appear blue to the eye.

  Gemma, Colchester essex