Hair dyes: Do they or don't they?

Discusses whether hair dyes can cause mutation in certain bacteria as observed by U.S. scientist Bruce N. Ames. Tests conducted by Ames and his colleagues for confirmation of mutagenic nature of dyes; Test results on the possibility of cancer and birth defect risks associated with the use of hair dyes; Need for a regulation by the Food and Drug Administration forcing cosmetic manufacturers to market safe products.