Thanks to all participants (link to survey results in 1st comment).

So, should you ask your candidates about their color preferences.
The answer is NO.

Here is why:

1. Not predictive - there is no scientific proof that color preferences predict job performance.

2. Candidate experience - let’s say that color preferences were predictive of job performance, Is it worth the poor candidate experience? imagine a candidate for a sales, customer service, analytics or practically any other position encountering these questions in their assessment - what probably goes through their heads is: why are they asking me this? how is this actually related to the job I’m supposed to do.

3. Fairness - some people are just color blind.