A shampoo that makes nits glow under ultraviolet light has been developed by a US researcher. Dr Sydney Spiesel (assistant professor of paediatrics, Yale university school of medicine) says that the shampoo is not a treatment but a disclosing agent that makes the nits easy to find so that they can be removed by hand. The shampoo contains a non-toxic fluorescent dye that binds to the nit shell, he says. A spokeswoman for Yale told The Journal on July 3 that the shampoo had been patented and that there were plans to market it.