When looked at under a strong light, many white spots indicate that the shell thickness varies considerably, whereas an egg without such spots means that the thickness is uniform and the eggshell is suitable for carving.
而蛋在強光照射下，若有很多白點，表示蛋殼的厚薄度差異較大；如果完全沒有白點，則是厚薄度均勻，最適於雕刻。