Three years ago, Hendrik G. Luitwieler, official restorer for Rotterdam's Boymans Museum, was examining an interesting 15th century painting up for sale. Titled Offering of the Jews, it showed solemn-faced men in bright robes about to sacrifice a lamb. The painter's name was unknown, but similarities in style clearly identified him as the painter of another work, now in the town of Douai, France, showing the Israelites receiving manna from heaven. Art experts call the unknown painter "the Master of the Collection of Manna," believe that he lived in northern Holland.
As Restorer...