I have tried several different vines and it is always something different... some vines are very clean, other very dirty! Sometimes you just need to filter a bit, basify/acidify twice and you get fairly clean harmalas. I am doing an extraction right now and it has been a pain in the ass! Took a long time to filter and the first precipitate was so dirty that I had to do around 5 acid/base cycles to get it to a mud color. I tried Manske but by the looks of it... its not gonna go very well either!
25g is a very small amount though... I wouldn't do less than a 100g, not worth the trouble! Anyways, filter the precipitate, acidify again, see how dark the solution is and whether it is transparent or cloudy. If it is not transparent, do a few more acid/base cycles. If you had larger amount, I would have suggested doing Manske once the solution is transparent, but with 25g... just do the acid/base cycles until it's clean enough.
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