EN
The wing under examination comes from the altar of St. Jodok in the church in Sątopy. It is the property of the Mazurian Museum in Olsztyn, displayed in the castle in Lidzbark Warmiński. The wing is divided into two panels with paintings on both sides, 94,5 x 85,5 cm large, and executed with tempera on pine boards. The date of their origin has been established as the beginning of the sixteenth century. The wing has been already subjected to several conservation procedures. In 1990 it was handed over to the Department of the Conservation of Paintings and Polychrome Sculpture at the Mikołaj Kopernik University in Toruń. The wing was strongly warped and the painting layer in a state of deterioration. Owing to considerable difficulties in straightening out the base (each of the panels reacted differently to moisture), the only way to salvage the object was to transfer the wings of the polyptych to a new, stable base. Originally, the streppo method was taken into consideration but ultimately abandoned due to certain hazards involved; as a result the boards , some 0,8 cms thick, were separated with the help of a specially constructed device. After many difficulties, the two panels were separated without harming the painting layer. At the same time, studies were conducted on the selection of the new adhesive and base. It was decided to use a plexi board and the application of various glues was considered. Next, the resilience of such adhesives as Rhoplex B-500, Acrylkleber 360HV, Rhoplex+chalk (1:1) +Acrysol G-110, Rhoplex +Acrysol G-110 was tested. It was found that the most suitable adhesive was a mixture of Rhoplex, chalk and Acrysol. Additional tests were carried out with Araldit SV which has the consistency of putty. The Rhoplex mixture was used for one of the panels and Araldit SV - for the other. The placing on the new plexi base was performed on a vacuum table and a pressure of about 600 mB was applied.