《明史·志·卷四十一》
百姓乘坐的车及轿，都用黑色油漆，齐头平顶，黑色帷幕，禁止用云形图案。
庶民车及轿，并用黑油，齐头平顶，皂缦，禁用云头。
The cars and sedan chairs used by the common people are all painted with black paint, with flat tops and black canopies. The cloud pattern is not allowed.