Century Egg / 100 Year Old Egg / 1000 Year Old Egg – China Its neither a century nor a millennium old, but this egg is pretty rotten. After being preserved in a mixture of clay, ash and quicklime for a few months, the yolk turns a dark green or even black and slimy while the white has turns to a dark brown translucent jelly. Apparently it smells of strongly of sulphur and ammonia, but tastes like a hardboiled egg… until you breathe out that is. Маrkova Katya 7 B