[Petronski]

Known as "Prussian Blue" — a nod to their German heritage and bright blue eyes . . .

Prussian Blue is another name for prussic acid, which is hydrocyanic acid, which is HCN and was once marketed as Zyklon-B, a rat poison made infamous when it was used to gas the Jews in the Holocaust.

These people know exactly what they are doing.

[dighton]

Two lousy seconds!

[cyborg]

Wow isn't that AMAZING? Doesn't zyklon-b leave a blueish stain after it's evaporated?

[durasell]

...and they're in NYC. They've been trying to recruit kids down in the east village.

[Tax-chick]

OH, how gross! I was thinking of that dreadful color they put on the walls in the 1830's!

[Alexander Rubin]

Wow, never thought of that.

[Erasmus]

Zyklon-B

I've been waiting for decades for some skinhead/punk rock group to adopt that name.

[SauronOfMordor]

Prussian Blue is another name for prussic acid, which is hydrocyanic acid, which is HCN and was once marketed as Zyklon-B, a rat poison made infamous when it was used to gas the Jews in the Holocaust.

Prussic acid is a solution of hydrogen cyanide (HCN) in water

Prussian Blue is Fe[Fe³⁺Fe²⁺(CN)₆]₃

[spanalot]

close but no cigar - you were one entry away from being right - prussian blue is a common ferrous based mineral

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vivianite

a. A monoclinic mineral, 2[Fe3 (PO4 )2 .8H2 O];
colorless where fresh; turning blue on oxidation; soft; a secondary
mineral found in ore deposits and pegmatites, in clays associated with
bone and other organic remains, and in anaerobic lake sediments.
Syn:blue iron earth; blue ocher; Prussian blue.
b. The mineral group annabergite, baricite, hoernesite, koettigite,
parasymplesite, and vivianite.