colours

So guys, as you are all aware, at the recent ITTF AGM the different rubber colours was approved and will be in effect after the 2020 Tokyo Olympics. We have some very first images of what the rubbers will look like on blades. See here for yourself: Here are all the colours in one...

You can see the chinese players in shirts with different colours when they play against each other. For example at WTTC 2013 Xu Xin had a yellow shirt when he was playing against Zhang Jike. ZJK had a black one when he was playing against Wang Hao. When do they put on which colour? Is there any...