If this is done outside of water in the air, the eggshell will inevitably crack. After the egg has been cleaned out, the membrane is cut cleanly away from the carved gaps, and this concludes the 'engraving' process.
清理蛋內物後，再以手術用鐮刀將鏤空處的蛋膜刮除，即完成「鏤空」雕刻。