Sulphide

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Waste buried under a hotel owned by Jack Robertson produced methane, sulphides and trichloroethylene. That caused mutation of spiders, allowing them to grow larger than normal. (TV: Arachnids in the UK)

Behind the scenes

In the context of Arachnids in the UK, sulphides refer to compounds containing the sulphur anion S^2-, which is itself known as sulphide. As the formula S^2- suggests, sulphide is the form of sulphur which has gained two electrons and therefore has a charge of -2.