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          knowledge  
          
                                   
                 
                                      author：entertainment   
                                        
                                      
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          Hair sample
          Alissa Ambrose/STAT
          WASHINGTON — Back in 1980, when the Food and Drug Administration approved the use of lead acetate in hair dyes, little was known about the way skin absorbs toxic chemicals.
          The skin — and the scalp in particular — were considered tough barriers to break, and many public health officials believed that even if small amounts of lead got through, or were inhaled, it couldn’t really hurt anyone.
          advertisement
          But in science, 37 years is an eon. So a coalition of environmental groups, academics, and consumer advocates is pushing FDA to take lead acetate off the market. It is now permitted as a color additive.
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