When it comes to colours, it is impossible to satisfy the fans. Everyone has its own perception of them. Some fans probably think that the colours should look like when they saw films projected in theatres. But the fact is that projection screen is absolutely crap when it comes to colours and fans now have distorted impression of the colours.
The colours on old film stocks are now completely altered (not to mention they varied between the copies even when they were in prime condition). As I stated once already, the a good option would be to call in the DP and/or Director and let them give their guidelines based on what they were seeing and trying to capture on the set.