Black Plague the button sequence for the chemicals

[Yuhaney]

Quote taken from GameFAQ's walkthrough for Penumbra: Black Plague:

According to the notes they need to be mixed in this order:

- Chlorine (2)
- Acetone (1)
- Iodine (4)
- Bromine (6)
- Nitrogen (5)
- Sulphur (3)

* Push the buttons in the above order remembering the button sequence on the
machine is:

1 2 3
6 5 4