Kohl is a cosmetic product traditionally made by crushing stibnite (antimony sulfide). Modern kohl formulations often contain galena (lead sulfide), and in some cases charcoal or other pigments. Kohl is similar to eyeliner, which was traditionally made from charcoal. Kohl is widely used in many cultures to contour or darken the eyelids and heighten beauty marks. Several studies have questioned the safety of kohl out of fear of lead poisoning. Additionally, importing kohl into the United States is banned.