  urlLink Hair Dye Linked to Blood Cancer : "Long-term use of permanent hair dye -- in dark colors -- doubles a person's risk of certain blood cancers, new research shows. Earlier studies have linked permanent hair dyes to bladder cancer as well as to the group of diseases known as non-Hodgkin's lymphoma. Non-Hodgkin's lymphoma rates are up all over the world. Nobody knows why, says Yale researcher Tongzhang Zheng, ScD. " 
