Photos and videos of eggs with black yolks that were reportedly laid by a grey goose have been doing the rounds on social media and leaving experts scratching their heads.

The intriguing photos and videos of the black eggs were posted on Sina Weibo last week by a man surnamed Zhu from Hangzhou City, in China’s Zhejiang Province. He claimed that the eggs came from a friend of his who kept many grey geese on his farm, and who had gifted him batches of normal goose eggs before. Only this time, what looked like ordinary eggs of standard size and white color turned out to be somewhat of an oddity. When cracked, the eggs revealed a clear egg-white, but a dark grey, almost black yolk, instead of the normal yellow or light orange.

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Owakudani, also known as the ‘Great Boiling Valley’, is a large volcanic caldera that formed 3,000 years ago when Mount Hakone erupted. The explosion was so powerful that the area is still active with boiling pools of water and huge vents that expel steam and volcanic fumes of sulphur dioxide and hydrogen sulphide. That hardly sounds like an ideal tourist destination, but hordes of people visit Owakudani each year in search of the mystical black boiled eggs, locally known as ‘Kuro-Tamago’.

These black eggs might look other-worldly, but they’re actually just plain chicken eggs. The strange black hue comes from boiling them in the sulphur-rich hot water pools of Owakudani, near Hakone, Japan. The sulphur in the water reacts with the eggs’ shells, making them black and imparting a sulphur tinged flavour and odour to the cooked egg inside.

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