ConfusedJew wrote: ↑Sun Jul 20, 2025 9:14 pm
I didn't say anything like that and you are not understanding what I actually did say. I will reserve my responses for HansHill.
But to be clear, chemically reactive iron (necessary for the formation of PB) is not generic iron.
Forensic studies showed that the plaster in LK1 had very low permeability. The concrete/mortar used in the gas chambers likely had lower free iron content compared to the old red bricks used in delousing chambers. The materials in gas chambers were similar, but not identical, to those used elsewhere in the camp.
I have provided you reference material on the permeability (rates of absorption, diffusion and porosity), all cited and linked earlier and above. If you are challenging this, then kindly produce these "forensic studies" from LK1. I've already given you the Markiewicz study which omitted such basic measurements as iron content, so I will await this forensic study with bated breath.
Iron in materials typically exists as iron oxides (Fe₂O₃, Fe₃O₄, FeO) – stable, oxidized forms (like rust), bound in silicates (within sand or aggregate), traces of Fe in cement clinker minerals. These aren’t very reactive with cyanide under normal conditions. What’s needed to form Prussian blue is free Fe³⁺ ions — that is, iron soluble in water and capable of bonding with cyanide ions.
This is simply not true. The Schwarz and Deckert study i posted earlier from 1929 exposed various building materials to HcN and produced the following results:
Per Rudolf:
A very interesting set of data was gained by Schwarz and Deckert as pub-
lished in 1929 (p. 203), which I list in Table 9. They had exposed different
masonry materials to a nominal concentration of 22.5 g/m3 HCN for 24 hours,
and then measured the amount of HCN contained in their samples right after
the gassing and again after several hours of ventilation. For one thing, the
results show the durability of very high concentrations of hydrogen cyanide
over longer periods of time even in dry, chemically bound cement (see Chart
11). Concentrations did not fall below 1⁄4 of the initial values even after three
days. With daily fumigation lasting several hours, this would result, in this
example, in an average HCN concentration in the wall swinging around ap-
proximately 100 to 200 mg hydrogen cyanide per m2 of masonry.
The second result we can obtain from this is that fresh concretes and ce-
ment mortars absorb much more HCN in comparison to samples that are
chemically set (here by a factor 26), and that their HCN content doesn’t seem
to drop anymore at all after some 3 days. It seems to have been chemically
bound. In any case, the difference between the somewhat fresh sample and the
set sample increases with time.
So your speculation is simply not supported in the literature.
Most iron in concrete or plaster is tightly bound in mineral lattices, does not dissolve in water easily, is not available in ionic form (Fe³⁺ or Fe²⁺). In other words it was there, just chemically unavailable for forming Prussian blue.
I am very familiar with this material, including all studies from both sides and I have never seen this argument being made. In fact, Markiewicz neglects to comment on the properties of the Iron entirely (!) and Green agrees with Rudolf's proposed explanation that the PB formed in the delousing chambers (across all materials - plaster, cement and brick)
using the perfectly available iron in the building materials, so you are arguing something here that is not supported either by the literature, or your own experts on this debate.
In Leichenkeller 1, the surfaces were plastered and smoothed, sometimes whitewashed. Whitewashing adds lime (Ca(OH)₂), increasing pH even more. The gas chambers were cold, damp, and not continuously exposed.
These factors combine to seal the surface, prevent deep penetration of HCN, and minimize moisture + air exchange, which is needed to generate soluble iron ions.
The permeability of plaster along with all the other materials has been addressed and this is redundant.
**Edit**
You seem to be arguing for Schroedinger's Plaster and Schroedinger's Cement. Sometimes the reaction will be supported (eg Delousing chambers in Birkenau and Majdanek) and sometimes it won't.
The problem here is that the parameters across both are measured and are comparable for each parameter (including iron content, iron properties, permeability, diffusion, porosity and any other metric you wish to investigate)