The author describes the conservation treatment of a retable with five scenes of the passion. The whole structure is incomplete - no adhesive had been used to join the planks of wood, originally. The new wood which was added to complete the structure was stained with a lime and ammonia solution to match the original. Painting, paint layer analysis; painting, filling; painting, tempera; pigment, analysis; painting, microscopy; painting, ground analysis; painting, wood support reinforcement; painting, wood support deterioration; painting, wood cradle; altar, altarpiece conservation; altar, altarpiece reconstitution are discussed.