I just wanna make sure I understand this correctly:
Potion of Barkskin (CL 12) lasts for 2 hours.
Now, lets say I use Extend Potion (making it 4 hours) and then use Amplify Elixir (making it 8 hours) and then I use Alchemical Allocation so I can use this trick over and over again.
Is this correct?
Extend potion allows an alchemist with this discovery to have a potion function at twice its normal duration.
Amplify Elixir extract has the effect of "extend"ing the barkskin potion (double duration).
Unfortunately this could be interpreted a few ways:
a) 2 hours x2 x2 should give 8 hours of barkskin. Which would be the most logical.
b) However, if it works like critical multipliers on weapons, then adding more multipliers just increases the first multiplier by 1. i.e. 2hx3 which would be 6 hours.
c) Or you could argue that "normal" for a potion is 2h. so extend potion and amplify elixir are actually doing the same thing and so 2hx2 = 4 hours.
I would rule a.
Course, all this speculation goes away if you use Eternal potion.
Alchemical Allocation extract has the effect of backwashing your potion to gain its effects without using up the potion. So no problems here. In fact if you use Amplify Elixer first (which must be done anyway for this to work) you extend Alchemical Allocation to 2 rounds which means you can drink/backwash 2 potions without using them up.
I don't think Amplify Elixir applies to extracts (it calls out potions or elixirs, but not extracts)
Therefore, the sequence would be:
drink Amplify Elixir extract, then drink Alchemical Allocation extract, then drink potion of whatever, then 'spit' potion back out to use again.
therefore, u couldn't use alchemical allocation for two potions (unless u consume a new alchemical allocation extract)