Help! What material is my roof? (Pictures)

[Erik190]

I am going to put up a (heavy) ceiling lamp in my apartment. There is a ceiling rose and a hole but no hook - the question is, what material is the ceiling made of? Crumbs are coming out of the hole and it seems to be some kind of cement and straw(?) inside. The building was constructed around the year 1910.

 

[Spikrätaren]

I'm going to install a (heavy) ceiling light in my apartment. There's a ceiling rose and a hole, but no hook - the question is, what is the material in the ceiling? Crumbs come out of the hole and it looks like some form of cement and straw(?) in there. The house was built around 1910.

Then the ceiling is probably plastered. You probably have boards behind it. First, try threading in a sturdy hook and see if it doesn't pull.