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But an investigation by the California Dept. of Toxic Substances found containers of acetylene, a highly flammable gas, on site earlier this month.

The Weisenbergs’ defense attorneys, Vicki Podberesky and Benjamin Gluck, argued their clients separated the offending acetylene canisters as soon as they were discovered and kept them away from machinery that could cause an explosion.

"We've detected water and other molecules like carbon monoxide, carbon dioxide, hydrogen cyanide, and acetylene. However, the emission found was weaker than some models predicted. This might imply a small outer disk radius."

Eventually, Congress came to realize that something must be done, and a temporary first lighthouse was built in 1912, an unmanned acetylene lamp.

Webb, sensitive to a large swath of the infrared, should find all those gases and more, including ammonia, acetylene, and hydrogen cyanide.