Many people don't realize it, but seperating meth oil freebase from mdma oil freebase is a breeze.
You literally just take a pipette, draw up the oils, and put them into a separate beaker.
Then all you do is leave the oils out at room temperature. Meth freebase will break down relatively fast into ammonia
and other gasses.
MDMA freebase oil has a much stronger bond, and higher boiling point, and would stay an oil at room temp.
So you wait an hour, put your nose over the solution, and smell for ammonia. If you smell ammonia, your MDMA is
contaminated with meth. And you will need to keep conducing sniff checks until you no longer smell ammonia.
Once the smell of ammonia is gone, that means all methamphetamine freebase is gone.
What would be left is pure MDMA oil.
You add dilute HCL very slowly until all the oil dissolves into solution.
Then evaporate, weigh the final product, calculate purity.
The reality is though, you'd need an experienced organic chemist to run out the procedure.
I know the different smells of every freebase oil you can think of. So if there are other oils,
I would know how to distill out those oils (using boiling points) or distill out the MDMA freebase.
All I'm saying is testing purity is more than possible. There is a popular book organic chemists use,
I forgot the name, but it has every organic compound you can think of, drugs and everything.
It listing the boiling points, solubility, decomp temps, everything you'd need to know encase
there was the presence of other drugs.
But MDMA is always contaminated with a small percent of synthesized byproducts, and most chemists
don't bother separating them cause its less then 1.8% the total weight.
So in most cases, I would only worry about identifying and separating meth freebase.
-Bo