Chalkboard and Blackboard Difference?

Can "chalkboard" and "blackboard" be used interchangeably? If I have a green chalkboard, can I still call it a blackboard, or would that be incorrect?

Also, I have heard that "blackboard" is used more than "chalkboard" in certain areas, and am not sure about how true this is.

Solution 1:

When I was at school (in the 1960s, in the UK), our blackboards were neither black nor boards: they were green and were of a continuous sheet flexible material rotated on two rollers (top & bottom). But we still called them blackboards!

Addendum
As far as I'm aware, the term chalkboard is not commonly used in the UK, but would, of course, be understood.

Solution 2:

I would say the difference is more generational than anything else and the changeover from blackboard to chalkboard had nothing at all to do with racial sensibilities or political correctness. When I started school in 1955, they were all black and were called blackboards. In a new school I went to in 1957 the boards were green but since everyone was used to calling them blackboards, we kept the old name. (Just as we call the material in pencils "lead" even though it hasn't been lead but graphite for over a hundred years.)

I found that people who came along after the boards were different colors and no longer black tended to start calling them chalkboards. I'm not sure when this occurred, but probably sometime after 1960.