As You probably know, most posters were printed with the primary goal to be utilized, to be posted somewhere. Their producers seldom cared about longevity of the posters that they made. They often use ordinary and acidic paper.
Here is a recipe how to, reportedly, preserve posters for decades. I post it here to start a discussion on preservation, to share ideas. I am in no way endorsing this recipe, use it solely at Your own risk. I will be grateful if You share Your experiences with You, but please don't blame me if this recipe couses You any damage.
Richard Smith, assistant professor at the University of
Washington and expert in prints conservation, offers this recipe
for preserving posters for generations.
- Dissolve one milk of magnesia tablet or teaspoon in a quart of bottled club soda, mix well, and let the stuff chill for eight hours or so in the refrigerator.
- Next, pour into a shallow pan and soak the poster in it for about an hour.
- Remove the poster and pat it dry as well as you can before allowing to dry more fully.
The effect of this soaking, says Smith, is to counteact the processes which eat away at the cellulose fibers of the paper, causing it to turn yellow and brittle with age. Having timeproofed them with this process you'll be able to keep your posters intact for as long as 300 years. However, you must remember to have the posters resoaked every fifty years.
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