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The following is a list of individual properties which exert an influence upon the formation of Iron Blue.

Properties, which were approximately the same in both installations:
The (alleged) operating time (approximately 1 year).[545]
The (alleged) frequency of use (a few hundred times),[546] even if a document quoted in chapter 5.2.3.5. states that shortly after the putting into operation of these hydrogen cyanide disinfestation chambers, a decision was made to stop using them, see. p. 61. It may therefore well be that the cyanide residues to be found in these disinfestation chambers today result from considerably fewer fumigations.
The (necessary) application concentration.[547]
Both installations were (allegedly) put into operation more or less immediately after completion.[548]
Properties that were advantageous to the formation of Iron Blue in the disinfestation chamber:
The duration of the fumigation times led, in the disinfestation chamber, to a concentration of cyanide in the masonry between 16% and 30% of saturation; in the case of the homicidal “gas chambers,” however, only to values of between 1.6% and 8% could be reached (factor 2-19).[549]
Properties which were advantageous to the formation of Iron Blue in the homicidal “gas chambers”:
The morgues possessed cool, moist walls, which have a higher tendency, higher by a factor of 8, to adsorb hydrocyanic than the warm, dry interior walls of the disinfestation chamber under consideration (factor 8).[550]
Ceilings and walls of the morgue consisted of cement mortar and/or concrete, which, due to their longer-lasting alkaline properties and due to their greater specific inner surface area, are able to adsorb and bind hydrogen cyanide for a longer time and more strongly than the cement-poor mortar and plaster of the disinfestation wing under consideration. Quantification in this regard is difficult, but a factor in excess of two must be anticipated (factor 2).[551]
Property with an unknown influence:
CO2 content: whereas the disinfestation chambers will have had a normal atmospheric concentration (0.33% at that time), the level will have been considerably above that in the morgues as soon as the victims assembled inside until the room was ventilated. As discussed in chapter 6.5.6., the effect of CO2 on the formation of long-term stable cyanide compounds is not clear. Whereas a high CO2 does lead to a fast carbonization and thus neutralization of lime mortar, rendering it chemically less active, this is not the case for cement mortar, the material used in the underground morgue. This material is carbonized only very slowly, hence it retains its activity to bind HCN for a longer period of time.

According to these considerations, and leaving aside the yet unknown influence of CO2, the known factors indicate that rather more iron cyanide would have had to form in the homicidal “gas chambers” than on the interior walls of the disinfestation chamber in question ((8×2)÷(2 to 19) » 0.4-8). In actual fact, however, the homicidal “gas chambers” contain such low cyanide concentrations that they are neither capable of reproducible detection nor of adequate interpretation, but in any case at least some 150 to 10,000 times lower than those detectable in the walls of the disinfestation chambers. It seems unlikely that CO2 could be the reason for such drastic differences.

Or in plain English: When analyzing wall samples from the alleged “gas chambers” of Crematoria II and III, we ought to expect results which are in the same order of magnitude as the results of samples taken from the walls of the delousing chambers of BW 5a and 5b. What we do find in those “gas chamber” samples, however, is practically nothing. Unless, of course, it turns out that CO2 really has a dramatic effect in reducing the reactivity of cement mortar to bind cyanides irreversibly.

According to these considerations, and leaving aside the yet unknown influence of CO2, the known factors indicate that rather more iron cyanide would have had to form in the homicidal “gas chambers” than on the interior walls of the disinfestation chamber in question ((8×2)÷(2 to 19) » 0.4-8). In actual fact, however, the homicidal “gas chambers” contain such low cyanide concentrations that they are neither capable of reproducible detection nor of adequate interpretation, but in any case at least some 150 to 10,000 times lower than those detectable in the walls of the disinfestation chambers. It seems unlikely that CO2 could be the reason for such drastic differences.

Or in plain English: When analyzing wall samples from the alleged “gas chambers” of Crematoria II and III, we ought to expect results which are in the same order of magnitude as the results of samples taken from the walls of the delousing chambers of BW 5a and 5b. What we do find in those “gas chamber” samples, however, is practically nothing. Unless, of course, it turns out that CO2 really has a dramatic effect in reducing the reactivity of cement mortar to bind cyanides irreversibly.