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For projects around homes, the main replacement was lumber treated with chromated copper arsenate, or CCA, which was introduced in the 1940s.

It was sprayed onto fruit as a pesticide in the form of lead arsenate.

Bags of mulch that bear the council’s seal have been tested to ensure that they don’t contain lead paint, chromated copper arsenate and other contaminants found in old building materials.

In the 19th century, a concoction named Paris green was the insecticide of choice before being replaced by lead arsenate — an unholy marriage of arsenic and lead first used in 1892.

One of the earliest pesticides associated with cancer is arsenic, occurring in sodium arsenite as a weed killer, and in calcium arsenate and various other compounds as insecticides.