Welcome to the nexus frodo
I agree with daytrip's advice about trying different analouges. Rue, mhrb, even different varietys of vine from different sources.
Personally i like to brew up my caapi a semi traditional way using a crock pot and reducing on a stovetop. Rue, i just extract and do a manske tek on it, then dissolve in water/juice to get a much less repulsive liquid than tea.
MHRB, i won't drink tea make from it ever again i think. Its by far the worst thing i've ever tasted, even cactus tea is better than mhrb tea.
Also, check out the various a/b teks in the wiki. I find with mhrb, powdered or shredded, you can get better results if you make a tea from your bark with a bit of vinegar and distilled water, reduce it down to a highly concentrated liquid and filter it well, then add a lye or potassium hydroxide solution.
Pull with whatever solvent you choose, limonene, naphta, heptane, etc. I've always got better yeilds this way than stb teks like 69 ron's or teks where you just dump a bunch of lye, bark, and water in a vessel and pull from there.
If you filter the tea well, you can really emulsify the solvent/water phase, and it seperates cleanly and quickly (at least with limonene ime). Same goes with cactus, you get so much more surface area between the solvent/basic solution, and i think that drastically helps the freebase migrate into the solvent.
As well, its a much smaller scale, when you make a tea from lets say 250g of bark, and reduce it to 400ml or so of filtered tea. Then add 10-20g of lye/koh (potassium hydroxide) to 100ml of distilled water, and add that to your 400ml of tea.
Compared to the stb tels that call for at least 5x more base, and a lot more water, not to mention the bark, its a more effecient use of your supplies, and ime/imho just works better and is easier to do. Sludgy stb soups of bark and highly caustic water, or 69ron type lime teks imho, don't work/extract as well, and are far more wasteful/dangerous since you end up using a ton of base.
Cheers, hope you stick around, and learn from others/have something to teach us in return.
Best wishes on your journeys, and good luck with your extractions.
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