Update to 1.6.3, then pour the acid into Aldous's glass, not directly onto Aldous; if it still does not register, drag it into the glass and reload the scene. The official hotfix increased the glass hitbox, while the target-glass and drag fallback are practical route guidance rather than proof of a universal bug fix.
What to do
- 01Confirm the laboratory checkpoint.
Make sure the cabinet is open and the correct ingredient container is selected.
- 02Pour acid into Aldous's glass.
The normal route pours acid into the glass. Update to 1.6.3 first: the official notes say the glass hitbox was increased. If handing the item to Aldous does nothing, target the glass itself; a Steam report describes this as the practical distinction.
- 03Use drag instead of tap.
If the glass still does not react, drag the acid directly onto it rather than relying on a tap. This remains a recovery check, not a universal platform rule.
- 04Restart without overwriting.
If the acid still does nothing, leave and reopen the scene. Capture the build and platform before reporting the issue.
Common questions
Why is the acid not working?
Pour the acid into Aldous's glass rather than directly onto him. If the glass does not react, drag the acid onto it and reload the scene without overwriting the save.