an engraving with the ship and the two falling figures. Since its acquisition by the Museum in 1912, its authenticity has been challenged by several specialists, mainly for two reasons: (i) the relatively weak quality of the painting compared to other Bruegels, although this question is complicated by later overpainting; (ii) it is an oil painting on canvas, an exception in the work of Peter Bruegel the Elder who made all his oil paintings on panel. In 1963, Philippe Roberts-Jones, curator at the museum, and the Bruegel specialist Georges Marlier, hypothesized that an original panel painting had been later moved onto canvas, as was once common. Scientific tests In 1998, a mixed team of scientists from the Belgian Royal Institute for Cultural Heritage and the University of Utrecht attempted to solve the authenticity problem by a radiocarbon dating of the canvas that was supposed to be the original support. As mentioned here above, the conclusion of this dating was that P. Bruegel the Elder cannot have painted on this canvas. Later, in 2006, Prof. J. Reisse (Université libre de Bruxelles) challenged this dating on technical grounds. A sample of blue paint taken from the right edge in 1973 was re-examined by performing analysis such as scanning electron microscopy (SEM) coupled to the energy dispersive X-ray spectroscopy (EDX), which in connection with optical microscopy revealed the following structure and composition. From bottom to top: Canvas (from transposition); Oily lead white (adhesive); Thick oily layer with azurite (repaint); Chalk ground; Oily lead white with scarce particles of charcoal; Oily blue with azurite; with layers 4 to 6 being original. The presence of chalk ground under the original blue proves that this is a panel painting transposed on a canvas. The original blue layer is lead white with azurite containing a few grains of ochre and charcoal. These structure and composition match perfectly those found on other certified panels of Peter Bruegel. Moreover, it is noticeable that the wood charcoal particles are very peculiar, being very long and acicular, exactly the same as those found only in The Census from the same Museum. Recently, a study of the underdrawing using infrared reflectography has been published. Reflectography is based on the fact that the infrared light penetrates all colors except black. As a result, the drawing, mostly black, can be made visible. The interpretation of these reflectograms is of course more subjective, but in