Do you crack open the floaters to do the look smell test as confirmation?I had some very old pea eggs that floated, but they were stored on the counter for many weeks during the hottest part of the year. Other than those, and maybe a few others, I would say that the float test is a pretty good indicator of bad eggs.
I'm working on a "float test" project and happen to have these pictures of these bad eggs:
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I'm not 100% sure, but I think all of those are bad.