Here is where it gets interesting... No mesh, it is lath and plaster. I've had to cut into it in a few rooms and if there is a mesh I have yet to see it. I am wondering what was used in the plaster at this point.
Huh. I know lime plaster can contain significant levels of iron impurities, but I think even in the worst case those would be low enough to have an insignificant effect. Now I'm really curious too.
