Double, double toil and trouble.

<with thanks to Will for the title>*


Well I thought I'd add a splash of food colouring to the airlock so I could capture the bubbles better. Unfortunately I slipped , and more than a few drops went in.

So it now looks like the airlock is full of blood instead. Anyway, you can now see the bubbles moving through the lock.

I opted for red in case for any reason the liquid get sucked back into the vat (it can happen if the temperature drops too much)

* See here for the poem in full, and the context if you don't know what it refers to.