When first laid, all eggs are lemon-yellow. After three days, they will turn white if they are infertile, or turn black if they are fertile. Fertile eggs might hatch in about two weeks after being laid in the middle of the summer, but they usually won't hatch unless subjected to "winter" in your refrigerator for at least several weeks. Wait until the eggs turn black before putting them in the Ziplock bag in the refrigerator. Once you take eggs out of the fridge, they will hatch in 7-20 days, or maybe not at all. Direct sunlight in the morning for a few hours hastens hatching. Eggs will remain viable in the refrigerator for about five years.
You can buy eggs, artificial food, and other supplies from these sites:
Niles Biological www.nilesbio.com/ (they also sell display cases)
Carolina Biological www.nilesbio.com/ (also display cases and silk products display)
www.ladysilkworm.com (they also sell silkworm chow to make colored silkworms and colored silk)
Worms from http://www.silkworms.ca
Detailed information on various commercial strains of silkworms:
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