Add a new Saltpetre recipe because industrial amounts are unpleasant to make

[Kotlol]

as far as i can tell the sole reason urine is there is so you have a hard time making it, getting to 1000 potency is supposed to be backbreaking.

but you can also use an empty glass for 20u of urine, much faster than splashing puddles into it.

Remember this system was originally made when shifts were longer especially on RP... not sure on classic.
So now it's grueling... due to time? Eh.. whatever.

I'd say making it slightly easier wouldn't be the worst thing.