The United States Radium Corporation was built is New Jersey in 1944 and ended in 2007. The company used Hammers recipe of glow in the dark paint for people to see their watches or clocks in the dark. They called this product Undark. Radium Corporation assured that the products would not cause radioactive harm to people since it was in very small amounts. Although it was true for the product itself, it was not true for the works exposed to it. The company had a byproduct of radiation that is called Radon and although not harmful in the open can cause lung cancer if concentrated in homes. The factory caused a contamination of radiation in the Essex County area. Which resulted in the unearthing and reearthing of the areas ground.