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It is necessary to add tartaric acid dissolved in water gradually as you describe, or I can pour it in at once if we already know exactly how much is needed. I use a steam distilled free base. So I think that if I add it gradually, the water layer will not change color.

Thanks, I'll try and let you know. Please, what temperature should methanol be, just put it in the fridge or should I use the freezer instead

Please, what kind of centrifuge do you use? I tried filtering using reduced pressure and a Buchner funnel, but the tartrate was still wet at the end and retained liquid. I got a little D-isomer at the end

Hello, I greet you all. I want to share with you my experience with the separation of isomers using L-wine. I did three tests. 2x using methanol when I changed the ratio of free base methanol and tartaric acid in both tests. Both tests turned out basically the same, after combining the...