Its really hard to tell with some eggs. But a blood ring in a nice white egg looks like a semi circle of red , I have seen viening that looks similar so unless the egg is stinking or its obvious the baby is dead in there or what not I leave them a little longer to make sure . Im not very confedant in my abilities so I probly leave alot of clear or early quiters in for longer then I should but I would rather be safe then sorry as long as there is no weeping or smell , I often move the possible blood rings or quiters a little ways from the rest of the eggs just incase . I would suggest getting a room as dark as possible, even if that means going into a closet or something , What do you use as a candler. ? I put a energy efficant bulb the twirly ones in a lamp like that you use for brooder lamps the silver half bowl type ones I coverd the little holes and such with aluminum foil taped in place then cut a peace of cardboard to fit the circle and cut a small quarter maybe a tad bigger sized hole and then coverd it with aluminium foil and tapped it all the way around the edges to the lamp , it makes a pretty powerfull if a bit akward candler. I also use a small LED flash light that takes 3 aaa batteries , I have rechargables becuae it gets unnoticablly but definatly dimmer with each use so I change the batteries every other tiime I candle with it. I found with my brown pourus eggs the other set up worked better though.
Sorry if I didnt hanser your question
https://www.backyardchickens.com/a/...-egg-candler-using-common-household-materials


Sorry if I didnt hanser your question
https://www.backyardchickens.com/a/...-egg-candler-using-common-household-materials
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