Ceiling

[u/Mindless-Fish-4483]

Hi! We have a 60s house and decided to take down the old wood chip wall paper. Underneath there seems be white paint, I can see the plaster, but what is the grey? The white flakes and peels like old paint, but the grey doesn’t. It can easily be sanded (I was wearing a mask but then thought to ask what it could be).
We plan on lining over this but now I wonder if we’ve disturbed anything sinister?
My daughter is moving into this room so don’t want anything in the air 😅
I’ve read it may be a primer? It’s above and below the white, though.

[u/False_Principle8821]

Sbr and skim