In his experience, eggs must be the proper shape, neither too round nor too oblong, with smooth and even contours, and creamy white like ivory in hue. The whiter the color, the more lime there is in the shell and the less calcium, resulting in a shell that is too brittle and not suitable for carving.
他的挑蛋經驗是，蛋的形狀要端正，太圓、太長、線條不光滑平順的都不適合，顏色要帶點米黃的象牙白，因為顏色越白表示蛋殼的石灰質越多、鈣質越少，相對的質地也較鬆脆，不適合雕刻。