u/VincitQuiSiVincit

I have this old bookcase that has been stored in an outbuilding. Probably since the 1990s and the bookcase is therefore obviously older as it was likely originally in the home and later relegated to the outbuilding.

It is very damp as can been seen. Does anyone know what the backing material is? I wouldn’t have expected asbestos in a bookcase but it appears they used to put it in everything short of sandwiches.

Thanks in advance.