As I mentioned in my last post, Enid Blyton used pins to insert new pieces of text into the typescript for The River of Adventure. Pins, like paperclips and staples, have a nasty tendency to rust over time. This rust, if left unchecked, will not only cause the pins to eventually disintegrate completely, but will also eat through the paper and cause significant damage to the typescript.
So, as I have been cataloguing, I have been carefully removing all the pins I find, some of which are already very rusty. Once the pins have been removed, the pages are inserted into clear melinex sleeves. This means the revised text is held in its original position on the page, maintaining the integrity of the revised pages, while the melinex (a chemically inert transparent sleeve) stabilises the condition of the paper and makes it easier and safer to handle.