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I believe it was late 1914 to 1915.

The Germans used mustard gas alongside chlorine gas. The chlorine gas was extremely poisonous especially if breathed in, and could kill instantly. The Germans actually wiped out all the French soldiers with chlorine gas. And mustard gas was a yellowish- brown coloured gas that when it touched open skin, it would make the skin blister and it would eat away at it. The reason it's called mustard gas is cause it had the smell of grainy mustard.

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14y ago

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