Another form of paper conservation is called paperbacking. Whereas most posters can be supported by (are glued on top of) Japanese Masa Paper, which is also glued to a more supportive/durable acid-free cotton canvas, paperbacking is similar except the poster is only supported by the Masa paper.
Here I have paperbacked two classic magazine advertisements; one from the early 1950s, and one from World War II. They both received a light deacidification bath, but no bleaching as the paper is much thinner and less “sturdy” than most traditional poster paper. The results were very good! Classic magazine ads make great display items in any house or office!