The acid phase should be noticeable reddish, albeit quite dark. This makes me suspicious about the providence of your starting material. It's not unheard of that people, er, try to extract from previously used bark powder that has been strained and dried, etc. In this respect, it would be valuable to see a picture of the mimosa material you started with.

sounds to me like you are in UK?

all those things are legal, its only illegal if you plan to extract alkaloids from the bark, which obviously you didnt. obviously you had it to try out dying your own t-shirts like everybody else. why would you even have it for anything else??? its just some shitty bark for dying clothes REALLY well.

you also didnt buy anything, and you wouldnt have used your card even if you did, so how would they even know who you are?

most importantly, you havent done anything illegal and there are very few reasons to suspect that you have. it is very unlikely anybody could get a warrant to kick your door in based on you looking for a pipette and pH meter. however, they do not need a warrant to investigate you.

worst case scenario is that you will be watched for a while. your past bank transactions might be looked at, but thats why we always use cash, even when we are buying lunch. in this case i would suggest having a subtle clean up and keeping your head down for a while. but honestly i think you are being over paranoid. being over paranoid is better than being under paranoid though!

personally i would like to settle my mind at this point or at least know when i can stock up on a smoke again, but im not sure how you can do that without knowing your exact situation.
for me i would do something like, go back the next day or soon after and make sure the same person sees me and watch their body language without them noticing me watching them. pretend to look at things near where they are working after they have seen me or something like that. if they felt that i was doing things that the powers that be do not want me to know about then they will be watching me. they will also try to pretend they are not, but the stalkee is a step ahead in this game
thats just an example, be creative. whatever helps you sleep at night or preps you for whats to come.
its not a solution but it might help settle your mind or confirm your suspicions.

a good rule to live by in general (i find) is to always assume the enemy is watching and waiting to pounce. and everybody is a grass until proven otherwise. next time have a plan. sorry, i know its a bit late for that advice now

maybe one day we wont be under the thumb of an uninvited third party

some people will stand there for a few seconds confused as to why they are asking. how often do you get asked why you are buying something? this can be confusing and it is normal for some people to pause, whatever their motive.
some people also respond with "mind your own business!".
they are asking because they "have to". they probably dont care too much about your response unless you fit into the category that that particular person thinks is dodgy. maybe you do idk.

Yea I think I'm being a bit paranoid but she was definitely very suspicious, and I think they do sell them, they just didn't want to sell them to me. She said to start with that they do.

another useful tip. dont give out any personal information on the internet, even things that seem trivial are not. there are not many people in the world who fit that exact description. i would edit that out if i was you. hopefully its not too late :/

Ah cheers. So never plastic, always glass for everything. More shopping tomorrow then.

I'm going to try adding more water because the solution is very thick, maybe that's stopping the dmt from defusing into the naptha. Obviously I'll add more sodium hydroxide as well to try to get the ph up above twelve if it isn't already.