Your mileage may vary, but with our n-butane stones we have to break them up to purge them below 400ppm.
I imagine your SoP as well as which lab is doing the testing are the two major players there.
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You definitely can wash those stones with warm water (THCa being insoluble in water) but most terps arenāt especially soluble in water either, and that certainly wonāt help with any potentially entrained solvents.
Iād follow up that warm water wash with a cold pentane wash and a vac oven purge, and if entrained solvents are a concern, you will likely need to smash them up after the pentane rinse prior to the oven
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Beautiful my friend! Beautiful just beautiful!
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Well hey man thanks for reminding me that jar existed 
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Reseeding a jar can be tricky. You could end up with tiny side crystals or on the other end of the spectrum you could redissolve your crack rocks on accident
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Yeah so currently I just heated it and evaporated off about 28g of pentane (just over 10% of initial pentane) however, I did take out the ~22g stone and havenāt added it back because Iām just too worried about introducing that variable. I now have the jar sealed and cooling. It looks as though the stones in the jar shrunk a little as I heated it but not 100% sure. So now Iām guessing I just leave for a few days and see if they grow?
Edit: I heated it in a 96Ā°F water bath to evaporate.
Did me taking out that 20g stone have an effect as well? I would think either way the solution is still the same saturation level?
@Dred_pirate when youāre not busy maybe you could let me know about that question.
No need to get water involved. Yes to breaking them down to the size you are going to sell them before giving them a nice long purge with a little heat and you should have no issue getting to 0ppm residual solvent. I have never had any issues with adding crystals back into my solution after taking them out. The process of removing the crystal will increase the saturation level a bit because some solvent will evaporate, but if you have a good ratio of THCa to solvent to start you shouldnāt have any issues with nucleation/sugaring out and it may in fact help you grow your diamond faster
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Taking out a stone will have no effect on further crystallization. You evaporated some solvent and dissolved the small crystals, this will increase the solute concentration in the solvent and drive further crystallization. Now you are in the wash, rinse, repeat phase of growing diamonds. Just wait.
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Man you guys are awesome and fast. Thanks dudes feeling real good about this now 
That first emoji looked scared and I am not anymore lol
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Iād probably pour the solution out to clean jar (save ur rocks for seeds and drop them all back in when ready)and add a lil solvent and I mean a lil and heat the solution back up to dissolve all the sugar then let it slow cool before u add the stones like normal seeding
Do the 1st step again w what u have, remelting sugar then seed
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96f=35.5c which is .5 degrees below bp of pentane.
(adding clarity for safety, dont want someone heating pentane to 96c.
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Oh wow yeah good call. Just edited the post too in case they somehow miss yours.
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Thanks 
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To establish a deeper understanding about what causes sugar or diamonds to form think about the concept of high concentration zone and a low concentration zone in the solution.
When you cold crash a solution youāll see some THCa drop to the bottom of the jar due to the difference in density between the mother liquor and the THCa.
If you bring the solution back up to temp without disturbing the liquid at all, youāve created a āhigh concentration zoneā at the bottom of the jar.
As long as you donāt shake the solution around, that āhigh concentration zoneā will not homogenize back into the rest of the solvent when you bring that jar back up to temp. You can then bring the solution up to 96f and allow solvent to begin evaporating. The difference in density between the high concentration zone and the low concentration zone make it a bit harder for the THCa to incorporate itself back into the solution homogenously.
You can mimic this effect by adding a chunk of seed crystal before your solution has reached a point of saturation.
Using a container with a high aspect ratio (tall and skinny) like a test tube to crystallize in gives you greater control with respect to establishing concentration zones. It also signifcantly reduces any movement of the solution if you have to handle them for some reason.
Sugaring tends to happen when the concentration of the solution is the same everywhere. When the concentration of the solution is homogenous and you begin to reach that point of saturation, crystals begin to form everywhere in solution. Once this happens you wonāt be able to avoid the formation of sugar without adding more solvent to dissolve the crystals back into the mother liquor.
Itās one of the reasons why agitation causes sugaring to occur, because youāre homogenizing the solution so youāre creating and dispersing the nucleation points.
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Amazing explanation bro
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Ive got a theory that Iāve never tested because my centrifuge is currently without a rotor.
If youāre having a batch sugar up on you, you can probably just stick it in a centrifuge. Any tiny sugar crystals that have formed in the solution would be forced to the bottom of the container.
It would essentially be the same thing as dropping in a seed crystal. Though Iām sure thereās some kind of nuance that I donāt know about.
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They have neat tubes with drop in cups that have screen bottoms, the sugar stays in cup and terps to bottom of test tubeā¦this is how everyone been doing this
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I know, but Iām not describing the separation of HTE from the crystals though.
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I just noticed thatā¦
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Iāve had a similar theory for a while now, too. I want to try to get a solution to precipitate structures over time using centrifugal force
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