Factorio Forums

I have research labs and during some research the red potions runs out. Labs stops working but right after opening the lab popup window I see, that one red potion is present.
After putting some number of red potions the lab start working and (numberOfInsertedPotions - 1) red potions remains in buffer (which is correct) .

link to save is following: https://www.dropbox.com/s/zw6rdzi87k5am1w/lab-bug.zip

2 potion requirement?

I thought it was a bug too at first, but check the technology screen, some research requires for example 40 process of research, each process taking 15 seconds, and TWO red potions ! So yeah 80 potions in total.
Double check this when you start a research, not all research take one potion per process.

Nirahiel wrote: not all research take one potion per process.

That is correct (and intentional).