Posters collecting today is for both fun and profiit. Yet, the poster you thought was going to increase in value year after yearhas suddenly turned yellow after only three months and is now worthleess. What happened? What could have been done to prevent the yellowing? This article will discuss how paper is made https://m.post.naver.com/viewer/postView.naver?volumeNo=39273764&memberNo=23371807