Here the surface is being carefully washed back on the left to reveal a warm richer colour. On the right you can see what's termed a dead finish, notice the green anaemic colour. This results from over exposure to sunlight causing the surface polish to become opaque, its always a greyish green hue. The bottom two drawers have also been treated.
Another view of the finished Bureau. Notice the contrast in colour from the first image, anaemic and dull, to this image being richer and warm. Sun damaged or dead finishes are very common and very often hide the true colour that sits beneath, careful reviving will bring back the hidden colour.