Rag paper, containing hemp fiber, is the highest quality and longest lasting paper ever made. It can be torn when wet, but returns to its full strength when dry. Barring extreme conditions, rag paper remains stable for centuries. It will almost never wear out. Many U.S. government papers were written, by law, on hempen "rag paper" until the 1920s.5 It is generally believed by scholars that the early Chinese knowledge, or art, of hemp paper making (1st Century A.D. - 800 years before Islam discovered how, and 1,200 to 1,400 years before Europe, feminized seeds) was one of the two chief reasons that Oriental knowledge and science were vastly superior to that of the West for 1,400 years.