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[–] Yachtzyachtz 0 points 2 points (+2|-0) ago 

I thought that is why the color blue was chosen I the first place.

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[–] Ccrack 0 points 5 points (+5|-0) ago 

probably a few reasons, like the isreal flag featuring mainly blue.

the best reason for me though is that zyklon B leaves blue stains on whatever it touches