Long time ago the ping pong ball was white. But several years ago it changed to orange. I guess perhaps it was good for the visual effect from TV. But this Olympics I noticed that the ping pong ball changed to white balls again.
The ping pong ball is usually white with the the dark blue pingpong table, and the ball is yellow with the dark green table. I hope this sports can be popular around the world, not just the stage for our own.