The brewery say:
The tangiest fluid in the Vault City universe, a 6 on our sour scale which to date has only ever gone to 5… Brainmelting Fluid is a face-scrunching, tongue-twisting sour infused with lemon and lime juice, sherbet and a hit of raspberry that shocks with electric sharpness ‘til your brain short-circuits.
Sour Scale: 6
| Brewery | Vault City (Edinburgh) |
| ABV | 6.8% |
| Style | Sour |
| Package | 440ml Can |
| Allergens | Barley, Oats |
| Dietary | Vegan |