Just talked to my 84 year old mom and here is how she always does it.
put the eggs in a pan of cold water, bring to boil,
boil FIVE minutes, Cover, remove from heat allow to cool
in water.Keep covered.
No blue ring...
Yes, this works too.
LISTEN UP!!!! EVERYONE. THE BOTTOM LINE IS...WE ARE NEVER EVER GOING TO EAT BLUE YOLKS AGAIN!!!! :-)