Read the full story in the Chicago Sun-Times.
The substance is from potassium permanganate, a chemical compound produced at the Carus Chemical plant and used to treat drinking water, wastewater and industrial chemicals, officials said.
Read the full story in the Chicago Sun-Times.
The substance is from potassium permanganate, a chemical compound produced at the Carus Chemical plant and used to treat drinking water, wastewater and industrial chemicals, officials said.