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Candling is when a light is shone behind eggs, allowing an operator to check for cracks and see if they are fertile. Fertility checks need to be made five to seven days after the egg has been laid. If an egg is fertile, a pattern of fine red veins will be observed.
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Archives New Zealand - Te Rua Mahara o te Kāwanatanga
Reference: AANR 6329 60 A1511
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