Hatching Chicken Eggs Naturally - Step by Step Guide

Step 6 : 

Candling Eggs

after 7 days it's time for candling the eggs.

you'll need things like :- 
-an egg carton
-a strong flashlight
-a pencil
-a really dark room

Requirements

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PROCEDURE

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-a really dark room

While the hen is away from the nest, take all eggs carefully and lay them into the egg carton.
Carry them to your dark room and light through the eggs (like shown below)

In a fertilized egg you should see a small dark point with small spiderweb- lines around. Mark all eggs if they are fertilized or unclear,out them back into the carton and lay them back into the nest and repeat this step in about 3 or 4 days, if the unclear eggs still show nothing, discard them, don't worry, there's no life in there! ( if you have a dog you know what to do :D )

why discard? - the unfertilized eggs can rot and the gases/or moisture can kill the unhatched chicks around.Sure you can choose to candling the eggs every day, but i think it's quite risky to move the eggs more than necessary.