I did some research on the internet this morning, regarding the posts on ways to store our fabric and what to use to wrap or fabric on.....It seems there is a PH pen that you can buy in a scrapbook store or hobby store, that you can mark on your paper and it will give you the acid level.....
I am going to look for it for sure, as I do not want my fabric to be ruined, just because I am a neat-freak....

http://miniatures.about.com/od/print...-Materials.htm

thanks for sharing that link