Acid bug (but different)

[jens]

You will probably have to start over from an earlier save when you are sure the gooey substance is there so you can use it. I have tried to recreate the problem you are describing but could not so I think it can only be a very unfortunate cause of patching at a very specific moment.

You can also take your last save game in My Documents/Amnesia/Main and zip it and upload it here, maybe it can be edited to make the game think you have the right item for explosive mixing.