Just posted this in a different thread not to long ago, no point retyping. Its in regards to carf blotters, but advice is still relevant. If you can get less potent opiates especially if they still get you high, don't touch this. You will die. If your still set in using this regardless of what ive said feel free to msg me, I've already lost more than a handful of friends to this, and people need multiple narcan shots before they come to after they drop, and unless you have a sober friend with you - there's zero time to hit your self with it, you drop almost instantly, no on set.
In regards to your actual question. Powder is white and grainy in pure form. Users would have no knowledge of it mixed unless told so. Suggest them to ask , if their connect doesnt know, tell them to do a super small amount, like 1/10 or less than what they would do. Onset is immediate , no warning, just drop - so hitting self with narc won't be possible. They will find it in blotter form most likely, I've rarely heard of people selling powder form. Microgram doses are so low that cutting it properly is almost impossible. In almost a year of usage, had it once powdered from someone who was bringing it in pure - and they didn't sell it that way.
In my experince, people typically don't pass it off as anything other than what it is, and if it gets mixed into cocaine I highly suspect it to be inadvertent. No one wants to kill their customer, along with getting a homicide charge with it. People who handle carfent know how dangerous it is.
Carf blotters have been made in massive quantities for awhile already, resulting in tons of deaths. Even when people are told how strong and dangerous they are, people think their 'high tolerance' would migate the effects, and unfortunately, lose their lives. I don't care how high of a tolerance someone claims to have, because, unless you've done it within the past few days, you have no tolerance at all.
You can use them safely, just always remember;
1. Start small, you can always do a little more but you can't take back what you've already done.
2. Treat every blotter as if you've never done it before, even if it's from the same sheet. They typically soak an entire sheet at a time, hot spots are super common.
3. If your in a vehicle, wait a few minutes before you start driving in case it takes you down - been there, done that, and even with a super high tolerance for it and had the same ones a day prior, half (usually did a 1 to 2 at once) made swim drop while swim started pulling away. Luckily my buddy was in passenger n pulled car over from his side. Swim was completely unconscious after about 10 seconds after exhailing.
4. Don't shoot this shit, or any fent period. Oding from intravenously IS NOT dose dependent. Meaning; say you shot 1mg once a day for a week, same exact stuff. There's a chance on the 7th day the same dose will kill you, regardless of your tolerance increasing as well as being fine the 6 prior times.
5. Do not even think about using this if your an opiate novice. As I said prior, even people with beastish tolerance to opiates other than fent and it's analogs will have no subdued effects from this substance.
6. Again, this must be said. Always start small then work your way up in small increments.
And honestly, if you fuck with this shit don't expect to ever get high off anything else ever again. With fent, it's analogs and carf your tolerance increases every time you use - and the high only lasts for about 10min due to its short half life. Honestly, the pros don't outweigh the cons. Short half life, mortality rate and the outrageous increase in tolerance, which compiles with every use, it's not worth it. Especially if opiates of lesser strength still get you high.
When swim was in the height of swims use with this, one As given 50 of them at once (after already using for almost 5 months). Half knocked swim out, then had no effect. Then had to do a full 1, knocked swim out. Did another 1, no effect. 1 1/2 out cold again. All in the same evening. The next day swim went through over 30 and didn't get high at all and they were super potent. Swims buddy was dope sick from it as well so swim gave him half, he was out of it for almost 2 hours nodding hard - and this is someone with a tolerance for it. So take my advice.
Edit: didn't realize how old this thread was, my apologies.