Just a reminder for pregnant women....... Pyrogallol in many studies was found to be mutagenic for In Vitro Mammalian Systems ..... Some of these studies are mentioned in the link Jorge posted. Also, the amount of material necessary to damage the fetus is much smaller than the amount which can injure an adult. The most sensitive time for chemical interference with normal development is from the 18th to the 60th day after conception. Although people are not dropping like flies from dying their hair most doctors do recommend that women not dye their hair during pregnancy. So be careful.... and stay out of the darkroom if there is a possibility you are pregnant.
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