SWIM found some citric acid in the kitchen....is it possible to use it in an A/B or could there be something mixed in it for flavor that wouldn't be too good for spice?

Does it say anything on a label or anything?

If it's just citric acid, then it should be fine.

Ought to work - I've read many mescaline extraction teks that use it. You can get high purity citric acid online too if you want... I think the kind of citric acid you find in the kosher section of some grocery stores is fairly high purity as well (it's usually called "kosher salt".

The only problem is that it's highly soluble in water, and I think it's easy to accidentally add far more moles of citric acid than there are moles of alkaloid in your non-polar extract - leading to a relatively impure product after evaporation, and making it hard to estimate dosages by weight.

NB: I have never tried this and should not be considered an authority on the matter.