He initially extracted bufotenine citrate and crap-citrate from yopo seeds via SWIY's method. Considering the fact that dmt citrate is a little bit soluble in acetone and is found in small amounts in yopo, he assumed no dmt present in his citrate extracts.

He then dissolved the latter citrate extracts in water,and he basified by adding 10M NaOH dropwise. He did not take any intermediate pH measurements at this point. He saw clouds of precipitation after some point so he started adding more NaOH solution. At some point he observed that as the pH was gradually raised the clouds of precipitation disappeared.

He thought it was weird, so he added a few drops of 10M HCl, to bring the pH down a bit and the precipitations appeared again. He promptly centrifuged the liquid to collect the precipitates (which looked dark brown with a some white patches). He then took a pH measurement of the pH an found it to be just above 11. He does not remember the value very well, but it was not more than 11.5. Maybe 11.3.

The brownish freebased precipitates were not further cleaned. They were bioasayed and yes, they were bufo-like but pretty much unpleasant.

He then got the idea of trying to make a fresh extraction and selectively remove the brown crap out by selective precipitation at certain pH values. But he never got the time to repeat everything properly.

He has no clue at this point of why precipitates appear and disappear at certain threshold pH values. But he is confident that bufotenine can precipitate out of basic solutions. Even bufotenin's logP value hints to aqueous insolubility of its freebase.