Arsenic is a metalloid with the symbol As and atomic number 33. Historically significant, it was used in the Bronze Age to harden alloys and in the Victorian era for cosmetic purposes. Albertus Magnus is credited with its discovery. Arsenic's toxic nature has led to its use as a wood preservative and in semiconductors. Despite its toxicity, some believe small doses may be essential to our diet. Arsenic exposure can be detected through hair analysis.

What were the cosmetic uses of arsenic trioxide in the Victorian era?

What are some modern uses of arsenic despite its toxicity?