I had eaten them before with no issue. The eggs tasted fine, slight ammonia flavor, dark outer "skin" and the inner whites had a translucent yellowish color, yolks were gray with a sulphur overtone. I sampled at least 20 items at that dim sum, something else could easily have made me sick. I blamed it all on the century eggs. Gas like you read about. TOTALLY flushed out my intestines. And that was during a 36-42hr flight Changi to Narita to Chicago to home. Not fun. I felt really bad for whoever went to the head after me, and I HAD to go often. I was miserable.