Many years ago a few article drafts appeared on the late Harry Mazal's website mazal.org. One of them was entitled "Techincal requirements for a gas chamber and some observations on Prussian blue".
It turned out to be a draft of the article quoted by Dr. Richard Green in his devastating rebuttal of the fraudulent Holocaust denier Germar Rudolf. Apparently it was initially to be a part of the collective report responding to Rudolf, though later it was decided that only Dr. Green and Prof. Jan van Pelt would officially respond.
The drafts disappeared from the site some time later, and Mr. Mazal died in 2011. The paper was left unpublished, and it is highly unlikely that it will ever be published. Therefore I decided to post an excerpt from this article that concerns one point about the formation of Prussian blue with several valuable photos.
The excerpt follows. There has been some minimal editing of the references (like picture numbers).
