What would be the most suitable Pet Ether fraction to use to recrystalize
spice via freeze precipitation.
(Initial pulls being done with Toluene or Xylene & evaporated)
40-60 or 60-80 ?

As I cannot source Hexane or Heptane where I am...

cheers

Lighter molecules are better imo, so 40-60°C is the one i'd choose.
Still, the 60-80°C can be used without any problem.

Don't forget the evap test.