Arsenic has earned its sinister title as the “king of poisons,” playing a role in schemes and assassinations throughout history. Its danger lies not in its pure form, but when it combines with other elements to create deadly compounds. In its most lethal form, white arsenic, this tasteless and odorless powder interferes with critical bodily functions, making it the perfect weapon for those seeking power through poison.

From ancient Egypt to Renaissance Italy and 17th-century France, arsenic was a favorite among those seeking to eliminate rivals. Even during the Industrial Revolution, arsenic found its way into everyday goods, including wallpaper, food coloring, and cosmetics—often with deadly consequences.

But the story doesn’t end there. In the 1800s, chemist James Marsh developed a groundbreaking test to detect arsenic, paving the way for justice in a world where poisoning went unchecked.

Dive into the chilling tale of arsenic’s deadly legacy in this fascinating video by Ted-Ed!