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- #31
An egg could be a month or two old, and float due to evaporation(as liquid evaporates, air infiltrates), but still be edible(not rotten). Does that make sense?
OK, had to do some reading on this issue online to understand better.
As I now understand it, what makes an egg rotten is bacteria entering the egg. Fresh eggs have the bloom on them to protect against bacteria. Washed eggs have the bloom removed, and need to be refrigerated to slow down bacteria. So, ageing of the egg will be seen in the float test as older eggs will go from laying flat, to standing on end, and then floating as the egg liquid evaporates and the air sac increases in size.
The water test is just one way to determine how old an egg is, but it does not necessarily indicate that the egg is full of bacteria and therefore rotten. A fresh egg, if washed but left out on the counter top for a few weeks, might pass the float test because it's not very old but be full of bacteria because the bloom was removed and therefore become a rotten egg. Essentially, you need to apply the smell test to detect bacteria in a rotten egg and/or crack the egg in a separate container to check for color and freshness.
Well, in my case with the found egg, it passed the water test and did not smell. After hard boiling it, I peeled off the shell and it looked and smelled normal. But thank you for pointing out that there is a difference between ageing and whether or not the egg is edible/rotten. I had not considered that aspect.