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Nancy Drew: The Haunting of Castle Malloy Hints
I put it in the right bin, and it still exploded!
1 of 3: Before you let go of the chemical, you need to make sure the arm is as far back into the bin as it will go.
2 of 3: You also need to be sure there aren't any antagonistic chemicals nearby that will be touched when you open the arms. For example, that Hg next to the Category 2 bin will go off if you open the arms all the way inside the bin. That means you can't move that H2O until you get rid of the Hg.
3 of 3: Finally, make sure you're moving the arms open and not closed, as I did a couple of times before I figured out my mistake. D'oh!