THE RUDOLF REPORT

GERMAR RUDOLF · THE RUDOLF REPORTFig. 69: Picture of a room located in the northwest of the disinfestation wingof building 5a (see Figure 18). The exterior walls are located in thebackground and to the right, showing intensive blue discolorations causedby iron Blue. Taking locations of samples 9 and 11 are visible. On the left inthe picture is the interior wall, erected during the conversion to a hot airdisinfestation chamber. Sample 10, with a slightly positive cyanide content,was taken from this wall.than 40 years. But how did the pigment arise in such high concentrationsat this precise location, although the outside of the exterior wallswere not exposed to any direct fumigation? The low quantities of cyanidewhich diffused through the masonry are apparently sufficient toenable the formation of pigment on the outside of the wall, which wasmoist, especially during rainy weather, and its iron compounds werecertainly massively activated by environmental influences.The inside of the exterior walls of the disinfestation wing of Building5a are almost completely blue, even dark blue (see Fig. 69, below).Interestingly, the pattern of the brick structure located below the plasterhas made an imprint on the intensity of Iron Blue formation in theupper layer of the plaster. Such a phenomenon is similar to, e.g., thewell known condensation of excessive atmospheric humidity on coolwalls (for example, in large groups of sweating human beings, such asat rock concerts, in discotheques, or, generally, in poorly heatedrooms), which also leads to the formation of patterns exhibiting the260