Usually you will need to place the item facedown. Posters for example are rolled up so the image is on the inside. You will have to unroll it and place the image side down. If your item ever feels resistant to opening, don’t force it. Instead, try humidifying it.
It’s possible to try flattening without using a tube. Simply roll up the map or poster as tight as you can and bind it with rubber bands. It’s best though to use a tube so the item doesn’t get dented. Keep in mind that you need to roll your item in the direction opposite the curl. Flip your map or poster to the correct side before placing the tube.
If you’re worried about the rubber bands or tape damaging your item, lay the map or poster flat and cover it with heavy objects.
Avoid using synthetic fiber brushes like nylon scrub brushes. These are too harsh to be used on delicate items. If your item is very dirty, you may be able to have someone restore it. For example, a paper conservator may save your paper map.
More water will provide more moisture, which speeds up humidification. This can be risky if you don’t monitor your map or poster carefully. Misting near the map or poster with a spray bottle is an alternative treatment that can uncurl your item quickly. However, it is very difficult to get the perfect amount of water exposure.
Try setting a wood cutting board over the cotton and topping it with a couple of heavy books. The weight can help prevent the item from curling again. [10] X Research source
