THE RUDOLF REPORT

8. EVALUATION OF CHEMICAL ANALYSESFig. 68: The outside of the external wall of hydrogen cyanide delousingwing of building 5a in August 1991. Small amounts of cyanide whichdiffused through the walls are discoloring them at places still today. 50years of the most detrimental environmental influences did not change thisfact.hibits blue bricks and mortar joints (see 68, above). Sample 14 is aloose fragment of brick which is clearly dark blue at all points facingoutwards and therefore exposed to weathering. Sample 15a is mortarfrom the south wall, only the topmost layer of which was blue to adepth of approximately 1 mm. The cyanide value at this point musthave been above the average value of the first approximately 3 mm.Sample 15b is a fragment of brick, the blue layer of which was separatedwith a spatula (Sample 15c). The mass of the remaining fragmentamounted to approximately twenty times the layer scratched off; onlyslight cyanide concentrations are detectable here. The average concentrationhere must have been around 120 mg/kg. On the brick as well,the pigment has only formed in perceptible quantities on the outermostside, that which is exposed to weathering (in this regard, see the exteriorwall of the disinfestation chamber in Stutthof concentration camp,Fig. 65).Very important is the confirmation of the fact that the pigment actuallypossesses an enormous environmental resistance, since Samples14 to 15c were exposed to intensive sunshine, wind, rain, etc. for more259