Plus, its enduring market appeal and new secrets revealed in a restored Vermeer

Major restoration on Girl reading a Letter at an Open Window shows a large studded goblet later covered by a green curtain

Dresden exhibition will include Girl Reading a Letter at an Open Window along with key international loans and works by other Dutch Golden Age artists

Drastically altered composition of Girl Reading a Letter at an Open Window can now be seen in all its glory ahead of major exhibition

The uncovered figure changes the composition of Girl Reading a Letter at an Open Window

Laboratory tests revealed "sensational" discovery that the figure in Girl Reading a Letter at an Open Window was overpainted decades after the artist’s death