However , evidence is limited and inconsistent for the link between cancer from hair dye .
In 2004 a known human carcinogen , 4 - aminobiphenyl or 4 - ABP , was found in some commercial hair dyes .
Evidence is limited and inconsistent for the link between cancer from hair dye .
In 2004 a known human carcinogen , 4 - aminobiphenyl or 4 - ABP , was found in some commercial hair dyes .