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The lead-to-chromium ratio found in the factory is consistent with lead chromate, a compound that has been previously reported as a contaminant in certain spices, officials said.

Although he didn't know the precise health impacts of the lead chromate, he said, "it's common sense that chemicals are harmful."

He said that this does not mean there is no danger, noting that "if somebody were to drink water that was heavily contaminated with lead chromate, for example, they could have symptomatic consequential lead poisoning."

A further cause of lead poisoning is the use of lead compounds, such as lead oxide and lead chromate, as a food additive to make spices appear more vivid in colour.

That sludge was believed to be lead chromate, a suspected human carcinogen.