Portal 2

Portal 2

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Description
Cave Johnson here.
Some people had been asking: "What is that liquid on the test chambers? Is it acid? Is it poisonous water?". Well, I can assure you one thing: it's not drinkable. We have already tested this with some test subjects and now they are in a situation that they are not able to test anymore. So, to not lose more test subjects with something already tested, we are making sure to advice this to others test subjects: DO NOT touch this liquid.