WELL-GROOMED hair is a symbol of beauty for many black African women. Natural hair requires special care and attention, though, which can be time-consuming. Wigs (human or synthetic hair), weave-ons and other artificial hair extensions offer women an alternative to their natural hair. In Nigeria, these alternatives are very popular with women, both young and old. The synthetic hair value chain is a big business worth millions of dollars and is run by both local and foreign industries. Hairdressing salons flourish, providing styling and grooming services for women. But we’ve found that there are contaminants hiding in synthetic hair. Man-made…