Duck Egg Incubation

[alyssahockings]

So I’ve been incubating some duck eggs from my khaki cambells, it’s day 13 and this is what the eggs look like. Ive never incubated eggs before let alone duck eggs, can someone tell me if these are viable?

 

[nuthatched]

All look like clears (infertile), except the first and last ones, can you shine through the air cell?