The paper does not contain any acid, no fluorescent whiteners are added either in the creation of the 100% cotton paper.Crane sent me samples of all their paper choices for use on an Epson 9800 44″ Wide Format Printer…. This makes a fine art matte (rag) paper top notch quality.I have not yet tested the other papers, but will review them once I get my tests done.Besides from the other Crane papers, I will be testing and hopefully reviewing Moab & Hahnemuhle papers.