That seems like a concern.

Does the water really need to be saturated with tartaric acid though?

Will it not work if say the water is only 50% saturated with tartaric acid?

SWIM is thinking that this tek is a bust, the crystals that were spoken of earlier were likely just tartaric acid.

SWIM tried it in the following way:
saturated 25ml of water with tartaric acid.
Added 5ml at a time to 1/4 of a pull of limonene (the rest of which was salted with HCL and is currently evaporating with some beautiful needles on the fringes)
Heated in a bath of near-boiling water and shook until it no longer changed color.
Seperated the bottom yellow liquid and put in the fridge. Also put the tartaric-acid-saturated-water to make sure it
wouldn't precipitate.
Repeated with another pull of 5ml, was much less yellow. combined with other pull in the fridge.

8 hours later: both are clear, no precipitation.
Even if there will be precipitation after a while longer it definately won't be any large portion of the yield.

This tek: Bust.