《明史·志·卷六》
十三年四月戊戌日，陕西、甘肃结冰厚五尺，杂入各色沙粒，有青红黄黑四种颜色。
十三年四月戊戌，陕西、甘肃冰厚五尺，间以杂沙，有青红黄黑四色。
April 23, 1478: A five-foot thick layer of ice formed in Shaanxi and Gansu Provinces, with grains of sand of various colors (green, red, yellow, and black) embedded in it.