My 3rd grade did scratch boards with the tempera and soap this year. They
were so excited about it, we were doing still life drawings and they
practiced with great focus. Unfortunately, it was a huge let down when the
board didn not scratch off well or at all or flaked so they had no control. I
will try the india ink, but never do the tempera again. Cant risk losing
their enthusiasm after so much invested into their art.