File:Chengqiao artifact no. 35 cast iron.png

Fair use for Cast iron

 * Though this image is subject to copyright, its use is covered by the U.S. fair use laws because:
 * It is a historically significant photo of a famous artifact.
 * It is of much lower resolution than the original (copies made from it will be of very inferior quality).
 * The photo is only being used for informational purposes.
 * Its inclusion in the article adds significantly to the article because the photo and its historical significance are the object of discussion in the article.