A couple days ago, I decided to run an experiment to see if the matching colors of the yoyo/string had an effect on how much the user appreciated the yoyo. I was only able to perform this on myself.
These are the results:
String color: Yoyo color: Appreciation:
Yellow Purple Low, knotted and dinged it 3 times
Green Purple Very low, knotted once and ripped it off
Orange Purple Good, matched the speckles and had good contrast.
White Purple High, Looked AMAZING with the Purple.
Please enter your info in the same format if you wish to contribute. Hope this helps someone in the future.