hatching silkworm eggs

https://wiki-byte.win/index.php/The_Art_of_Feeding_Silkworms:_Fresh_Mulberry_Leaves_and_Beyond

You'll notice the eggs start as tiny yellow dots, then turn grayish-black as they mature. Keep them in a cool place until spring comes, and when mulberry leaves bud out, the little black caterpillars will chew their way out. It's amazing how such a small speck of life can transform into a silkworm.