Ok my niece has a pair of breeding Delaware Blue Hens. Well ones a roo and what a roo he is! Anyway, the first egg she got from mthe pair she wanted to hatch so she put it under a heat lamp. She doesn't have an incubator. After three days she candled it and found nothing. After five days: nothing. So she figured it wasn't fertile. But, then we all debated. If it has been under the ehat lamp for five days is it edible?