Man's skin, nails turn grey in rare case in Hong Kong

In a rare case recently, an 84-year-old man's skin, nails and eyes turned grey in Hong Kong due to argyria, which is the systematic build-up of silver in the body's tissues. In severe cases, when the silver build-up is very high, it can make the skin appear blue. Some experts claim that argyria does not have life-threatening complications.