The floating eggs are not necessarily bad….tho they might be. I’d only try it with our own eggs. Not trusting the egg industry but I know how old approximately our eggs are. Some float only due to dehydration thru the porous shell. As I mentioned above, I always break eggs into a separate dish to check. Any doubt then – throw it out. Not worth a chance.
Mineral oil was one of the ways tested in that link to Mother Earth News [above]
OldMtWoman