TLDR Selenium sulfide in anti-dandruff shampoos can turn hair green.
The document discussed a case of green hair discoloration caused by the use of selenium sulfide, a common ingredient in anti-dandruff shampoos. The authors, Elizabeth A. Fitzgerald, Stephen M. Purcell, and Howard M. Goldman, all from Philadelphia, Pennsylvania, reported this unusual side effect and suggested that the discoloration might be due to a chemical reaction between selenium sulfide and copper, which is often present in water pipes. This case highlighted the need for awareness of potential cosmetic side effects when using selenium sulfide-containing products.
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