This is one reason why Zyklon-B without indicator was requisitioned for Auschwitz. It put off the amount of time before panic set in -- otherwise it would set in the moment they smelled the indicator.
Green, Mathis refuted / cyanide: lice, humans, & more
Another gaff by Mathis is his suggestion that Zyklon had its indicator substance removed in order to prevent those being gassed from knowing and panicking. This is silly since the alleged mesh columns would have had a clearly visible container of material being lowered on a string. Even non-mesh column chambers would have had pellets poured through the roof portals. How in the world would those inside not realize what was going on at that point? It's absurd to suggest that scented or unscented would make a difference at that point. This is just another case of so-called holocaust experts exposing their ineptitude and therefore the falseness of their claims.
By 1944 Zyklon was being supplied to Auschwitz without the warning ingredient, but the reason for this exceptional practice was a supply shortage rather than any desire, as alleged by Exterminationists, to deceive potential murder victims. One cause of considerable concern to some of the German technicians at the time was that since the warning ingredient also contributed to the chemical stability of the Zyklon-B, its removal could present a serious hazard to the end-user. One result of the removal of the warning ingredient seems to have been the shortening of the shelf-life of even properly sealed cans of Zyklon-B.
The removal of the warning scent was decided upon by the DEGESCH manufacturers and not by the SS. This came out during testimony given by Mr. Breitweiser during the course of the Auschwitz Frankfurt trial in 1961. Breitweiser was in charge of disinfestation at Auschwitz. He was never charged with or convicted of a crime.
[for additional information see:
Hannover @ A. Mathis attempts to salvage Zyklon scent removal canard - M1]
The 'holocau$t' History Project nonsense bites the dust.