The cleaning and restoration of 2 altar wing panels (attributed to the post italian period of Martin Van Heemskerch) at the National Gallery, London, are described. Each panel has two figures on the front and a grisaille saint on the reserve. The condition and unframing of the panels are described. Technical examination of the oak panels identified chalk grounds with glue size, underdrawing grids and a tinted priming, 'primuersel'. Pigments and media (linseed and walnut oils) were identified. The panels represent the complex and everchanging interrelationships between paintings of Northern Europe and that of Italy. References, photographs, radiographs, photomicrographs