re:you can even buy green chalkboard paint.

And black chalkboard paint too--my daughter is planning on "painting" a large chalk board in her kitchen (and adding a narrow shelf for chalk and erasers, too)

OLM (my elementary school) also had 'modern' conveniences like a PA system. by 1962 or so, every class has a TV too, and we were notified over the PA that day in November '63 to turn it on..(for me, it was Music class..Miss Lang)