Several years ago I embarked upon copying this famous painting from one of my favourite artists. I haven't seen original (only the photos), so I relied on reproduction in a monograph.
The colors on that photo were a bit washed out in comparision to original and - of course - the printing inks are different than the oil paints. In cases like this it is not recommendable to slavishly copy a reproduction (bearing in mind all the drawbacks), so I approximated the actual hues. I mean, even the colors on original piece are different now in comparision to the Vermeer's time.