Designed for preparing books, albums, and other archival purposes, the Hahnemühle Photo Rag® Book and Album 220 gsm long grain 17 x 22-inch 25-sheet pack makes for an ideal choice. It features a thickness rating of 12.99 mils, a pH value of 7.8, an ISO brightness of 92.5%, and an opacity rating of 99%. You can even use this paper for both color, as well as black-and-white photography. Lastly, these double-sided pages have a low OBA Content and are highly resistant to water so that they dry up instantly.