I'm more than a little skeptical.

If you search by "drywall off-gassing sulphur" you can see a bunch of media reports.

A lot of it doesn't make sense. Black corrosion on Copper pipe is indicative of mould growth, not corrosion, when copper corrodes it goes green, like seen on roofs or statues.

Besides, corrosion can't occur in dry areas very well, and if it's in an area moist enough to cause corrosion, it will grow mould and metal will corrode anyways.

Best of luck.

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