Altarpiece of the Saints John Altarpiece of the Saints John The Altarpiece of the Saints John is a painting by Bernat Martorell conserved at the National Art Museum of Catalonia. The "Altarpiece of the Saints John" from Vinaixa was commissioned in 1432 from the Tarragona painter Ramon de Mur, but in the end it was painted by Martorell. The MNAC keeps most of the panels from this altarpiece. The main panel is kept at the Museu Diocesà de Tarragona, a side compartment is kept at the Musée Rolin d'Autun (France), and the whereabouts of another compartment is unknown. The two Saints John feature in the
Early Netherlandish painting both sides or with the reverse bearing family emblems, crests or ancillary outline sketches. In the case of single panels, the markings on the reverse are often wholly unrelated to the obverse and may be later additions, or as Campbell speculates, "done for the artist's amusement". Painting each side of a panel was practical since it prevented the wood from warping. Usually the frames of hinged works were constructed before the individual panels were worked on. Glue binder was often used as an inexpensive alternative to oil. Many works using this medium were produced but few survive today because of