Once the bile is too dry, sometimes the albumen or the yolk is not cooked well and therefore the perfectly boiled egg is the hardest thing which cannot be hit right.
This happens because the egg requires two different temperatures because of the different composition of the yolk and albumen. For perfection, the albumen requires temperature of 180 degrees and yolk requires 170 degrees.
One chef got the perfect idea of how to prepare the perfectly cooked egg. Put a few eggs in previously boiled water for 30 seconds and add a few ice cubes for lowering the temperature of the water. After, on every two minutes he extracted one by one egg from the water for checking the final results. Thus is revealed the secret of how many minutes you need to make the perfect boiled egg by your taste.