Blue and White Pottery Lamp that been attributed to the Royal Delft Factory (De Porcelyne Fles). I have many pieces from this factory. It is the best, it takes 7 years to become a master painter at the Delft Factory. This lamp was hand painted by a master painter in the flower design in shades of blue. The artist starts with the darker indigo blue and adds water to the paint for each subsequent shade. So all the dark on the whole lamp, then the medium, then the lightest.