Amnesia: The Dark Descent Walkthrough: Creating the Acid

down the stairs and back into the main laboratory room. Go to the
equipment table with the bottles and stuff. Now it’s time to combine
our chemicals!

Press TAB and double click on one of the chemicals. It doesn’t matter
which one you pick, as soon as you have chosen one, click on any of the
bottles in front of you and they’ll fill it up. Do it to the rest of the
chemicals.

As you try to fill up all of the bottles, another angry roar is heard.
Don’t worry about it and just put all of the chemicals in the bottles.

When you’re done, turn the valve on the very left to the right. You can
do this by clicking on the valve and then rotating your mouse clockwise.
Suddenly, the flames will come out from under the chemical bottles.

Open your inventory and double click on the Chemistry Pot and click on
the bottles. Your chemistry pot will then be placed under a faucet
connected to the chemicals.

The final step to complete our chemical combination is the turn all of the
four valves above the chemical bottles in a clockwise direction. After
doing so, the Chemical Pot will be filled with glowing acid. Grab
it to have a pot of acid!
From the main laboratory, go up the stairs. Oh no! You’ll find that the
stairs have been destroyed due to the earthquake! There’s a few possible
ways to solve this problem, however look around and stack things up near the base of the broken stairs and jump on it, then jump onto the stairs.