The white and yolk of fake eggs quickly mixes together after cracking it unlike the real ones.
Fake eggs have slightly shinier, harder and rougher shells than the real ones. Duplicate eggs also have a rubbery lining inside the shells.
You will hear sloshing sounds when you shake a duplicate egg as liquid will flow from the solid agent.
The real eggs smell like raw meat while the fake ones doesn’t smell at all.
Cracking a real egg lightly will generate a crisp sound when compared to other duplicate egg.
And lastly, the eggs doesn’t attract insects like ants and flies like the real eggs does.