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In early 20th-century paint production, cadmium sulphide was produced at times through a reaction between cadmium chloride and sodium sulfide.

After that, he adds sodium sulfide and sets the concoction aside for another four days.

Those minimal exhaust fumes had to go through a scrubber that used sodium chlorite, sodium hydroxide, sulfuric acid, sodium sulfide, three mixers, three pumps, a lot of water, and a great big blower.

Nearby, there’s Goodyear, with sodium sulfide, a dangerous chemical in rubber production.

The explosions were likely preceded by a fire in area where nitrocellulose and or sodium sulfide were likely stored, Zhong Shenjun, an associate professor of work safety at Northeastern University in Shenyang, Liaoning Province, wrote in an Aug. 16 blog entry.