Generally, what drug is usually pure and what often contains impurity?

[valerie1989]

I know the title sounds stupid but let me explain
I live in Canada and I can obtain many scheduled drugs through the dark web.
I have tried some psychedelic, weed, but the hardest drug I have ever tried is just esketamine. I bought it as a spray from the surface web.
Im planning to buy some MDMA and 2CB and other stuff on the darkweb, I can FTIR test them to make sure there not laced. However, im worry they are not pure. Im a very precise user so im planning to look up some information and measure the recommand dose to make sure I dont take too much. However if the drug is not pure the recommand dose will become inrelevant, which is not good.
From my understanding, meth and ketamine, mdma crystal, and 2CB powder can be very pure, like over 90% even 95%. I was shocked at first cuz I thought high-purity meth is hard to make after watching breaking bad.
But I dont know about other thing like heroin. Usually its laced but some dealer are selling something called Afghan or china white. The analysis from the market website official( not the dealer themself), claiming to be 3rd party, turns out the sample only contains heroin. I dont know why it happened, but pure heroine sounds so unreal.
Cocaine as well, I dont really know how pure cocaine usually is, I heard people claimed cocaine to be high heat or acetone washed, but i still dont beleive its pure.

 

[canaduck]

I know the title sounds stupid but let me explain
I live in Canada and I can obtain many scheduled drugs through the dark web.
I have tried some psychedelic, weed, but the hardest drug I have ever tried is just esketamine. I bought it as a spray from the surface web.
Im planning to buy some MDMA and 2CB and other stuff on the darkweb, I can FTIR test them to make sure there not laced. However, im worry they are not pure. Im a very precise user so im planning to look up some information and measure the recommand dose to make sure I dont take too much. However if the drug is not pure the recommand dose will become inrelevant, which is not good.
From my understanding, meth and ketamine, mdma crystal, and 2CB powder can be very pure, like over 90% even 95%. I was shocked at first cuz I thought high-purity meth is hard to make after watching breaking bad.
But I dont know about other thing like heroin. Usually its laced but some dealer are selling something called Afghan or china white. The analysis from the market website official( not the dealer themself), claiming to be 3rd party, turns out the sample only contains heroin. I dont know why it happened, but pure heroine sounds so unreal.
Cocaine as well, I dont really know how pure cocaine usually is, I heard people claimed cocaine to be high heat or acetone washed, but i still dont beleive its pure.

How do you find clean cocaine on the Darkweb in Canada? What are the most likely sites to check? Street level stuff is getting to dangerous. Asking for a friend!