Greetings,

I'm absolutely no lab rat either but the post I made contained ins-and-outs that deems-people get to know after a time simmering in for example this forum, knowledge that one build up over time. It's good to affiliate slowly with all those methods of extracting, solvents, ...

LC50 means toxicity when inhaling, in contrast to LD50 is toxicity by intake.

(50% of rats die at these concentration)

The mentioned numbers say that indicative, toluene inhaling toxic concentration is aprox 6x the one of Hexane.

Aliphatic hydrocarbons are straight chain molecules, these allow to precipitate (crystallize) under freezing. This in contrast to circular molecules (aromatics) like xylene and toluene that don't freeze crystallize but are ok for FASA techniques.

and so on..