Original sentence: "Overlaying" or folding or hammering on gold foil or gold leaf is mentioned in Homer's Odyssey (Bk vi, 232), and fire-gilding with mercury dates to at least the 4th century BC, and was the commonest method until the Early Modern period at least, though dangerous for the workers, as has been known for centuries: Today electroplating is the most commonly-used method
Edited sentence: "Overlaying" or folding or hammering on gold foil or gold leaf is mentioned in Homer's Odyssey (Bk vi, 232), and fire-gilding with mercury dates to at least the 4th century BC, and was the most common method until the Early Modern period at least, though dangerous for the workers, as has been known for centuries: Today electroplating is the most commonly-used method