A Nassau County electrician picks up a box of drugstore hair dye on the way home from a job in Mineola. Forty minutes after applying it, his scalp is blistering, his face has swollen past recognition, and his wife is driving him to a Long Island emergency room, where he's treated for a severe chemical reaction and airway swelling. The box named the ingredients. It said nothing about what those ingredients could do. Whether he has a viable New York failure-to-warn allergic rea