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Poison gas was also called mustard gas because of its mustard yellow color.

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Many countries, especially Germany, used this gas because it was a very powerful weapon since it could kill anyone who breathed it in without a gas mask.

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The use of poison gas was for killing the enemy by blistering the lungs, skin, and eyes. I reduced the enemy's response which helped the people using it.

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Poison gas is now banned because of how dangerous it was. Some countries still use it in wars and battles.

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It was very effective because of how toxic it was if it were exposed to a person, when inhaled.

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Where the gas was originally made was in Ypres, Belgium, on April 22, 1915.

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It had a great impact to the countries that used it because of how dangerous and effective it was. For example, Germany used this and it made them stronger because it killed thousands of people.

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Poison gas is a combination of toxic chemicals, mustard gas, bromine, and phosgene.