It is preferable to use white paper. However, having said that, both sets will be equally effective because the solution lies in the structure of the wave pattern itself. So, I recommend, using the set which you can see the best.
It is preferable to use white paper. However, having said that, both sets will be equally effective because the solution lies in the structure of the wave pattern itself. So, I recommend, using the set which you can see the best.