How would you ever know if it was restored to match the print’s color, then? Even when people are able to match the scan to the print by looking at the projected print while they’re doing it, they are of course matching it to a specific bulb (hopefully the correct one). I mean, the print doesn’t even technically have color without a light source to see it. 😉 I think some bias is required because almost 0% of people are going to be watching it with the ‘correct’ type of bulb, even among the lower percentage of people who will be projecting it in some way. But the print itself doesn’t posses some ‘bulbless’ color state that is both objective and correct, does it?