Small doses disinfect, but large chlorine quantities are deadly to humans.
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If you’ve ever seen movies about World War I, you know that the soldiers in the trenches often wore bulbous gas masks that made them look like human insects. The masks were necessary to protect them from chemical weapons such as chlorine gas, a noxious substance that could almost instantly suffocate unprotected victims.
“Bloodshot” is precisely the right term to describe what happens when something irritates the eyes.