What colour are head lice?
Head lice have a hard ex-skeleton, a sort of bone on the outside like a shell and this is a light brown colour but very thin. In clear light this makes them a light brown colour. When they feed they fill up with blood this changes their colour to dark brown. As they digest or excrete their meal they lighten up in colour. So when looking for lice you have to remember that they may be any colour from light brown to dark brown. 17.
