Wet cement has calcium hydroxide in it which is extremely alkaline and can burn skin. It'll also suck all the moisture from your skin. I wouldn't want to be those people in the morning. Hopefully it was a mixture that didn't include calcium oxide which is possible. Still those people are going to has some contact dermatitis for the next few days/weeks.
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“It is better to be rich and healthy than poor and sick” - Dave Barry
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