Hi.
I have done 3x acetic acid cock with 200g mhrb and evaped it down to just 900ml.
I let it sediment and decanted. I then measured ph and it was at 3.4. And then just to experiment and see how much NaOH raises ph I took a litte of my liquid and dissolved a teaspoon of NaOH in it and then slowly added it to the rest.
Instantly I got whiteish flakes precipitating out of the solution.
Mesured again and ph had raised to about 4.1. And now some days later there is a dark sediment on the bottom.
It can't be any goodies right? It should still all be salt form dissolved in the water. It should be good to filter the sediment out?
Any ideas of what it is and what happened?

/Love

Anyway, I decanted my brew and it had a lovely dark purple color, much clearer then the last time I decanted.
Measured ph and it was at 4.5, I must had remembered wrong in my last post. I slowly started to raise the ph with NaOH. And the reaction is really cool to observ. Around ph 8 and 9 the brew is totally milky white. And when it reach 11-12 it's becomes almost black. The transformation is instatly. Added some saturated saline solution. And did four pulls quite rapidly, first pull with 1dl and the rest with around a 1/2dl each . The solvent cloud heavily when blowing on it an its completely transparent, exept for the cloudiness
It's now been in the fridge for about 12h and its full of tiny white crystals.
Tomorrow I will decant of my solvent and do another 4x pulls in the same manner and see what I end up with.

So by just initially raising the ph by 1 it seams to hurry up the sedimentation a lot. Initially it feels like I got rid of much impurities. Just speculations of course. But I did a STB some time ago with the same batch and it gave me a yellow goo. I have to add that I didn't freez precipitate that time just evaped the solvent.. But that time the solvent was really yellow to begin with...

Yeah I'd imagine it is some impurities indeed, considering the pH was too low for alkaloids to crash. Thanks for sharing your experimentation