The head from a statue of a Roman God has been unearthed at Binchester Roman Fort near Bishop Auckland in County Durham.
It was found by a student at the dig, which attracts volunteers and archaeology students from around the world.
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People could suffer vision loss or infection from the lenses, which are often sold illegally online, in shops and on market stalls.
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The gallery has been made possible through the Heritage Lottery Fund who provided a grant of £422,600.