Are century eggs Rotten?

Online Answer
6: Pidan (Century old eggs), China A grey or greenish yolk doesn't necessarily mean that an egg has gone bad. At least, not if you're eating pidan in China, when the preserved duck, chicken or quail egg is served as a side dish or with rice.
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Ideally, century eggs are made by storing raw eggs for a few months in a mixture of wood ash, salt, lime, and maybe tea with rice straw or clay. ... Those eggs are made from duck eggs, lye or sodium hydroxide, and salt. That sounds scary, but it's probably OK to eat.
6: Pidan (Century old eggs), China A grey or greenish yolk doesn't necessarily mean that an egg has gone bad. At least, not if you're eating pidan in China, when the preserved duck, chicken or quail egg is served as a side dish or with rice.