Solution viscosity during re-x?

[Bisy]

So if a person were to heat their spice and their NPS to near boiling, the spice would begin to melt, therefore very little nps would be required to liquefy the lot. Im assuming this qualifies as a saturated solution.
but once removed from the heat, it would nearly instantly begin to solidify, giving a much different physical appearance from the crystals that form with enough nps for the crystals to precipitate out much slower.
My question is, for the purpose of growing large crystals, is it preferable to leave this wet solid solution in airtight container and let crystals grow? Or does there need to be enough nps for the solution to still be liquid at room temp with small crystals beginning to solidify?
Did I ask that question correctly? Let's assume heptane is the nps.

 

[Loveall]

The largest xtals I've grown are from cleaned up DMT that is slowly evaporated from naptha.

In my experience, both purity and slow growth are important.

There is more info in the FAQ, plus links in there with more details.

 

[Bisy]

Thank you for your reply, ive been through the fAQ, the MIT videos, and many of the threads several times. I am quite confident that I understand the concept of crystal formation, and why it is used as a form of purification, and also why it must be pretty close to pure prior to doing it.

I've seen the white snowball kind of crystallization, and the evenly distributed tiny shard crystals, and they all formed in a couple hours i guess, maybe more.

I guess my confusion has arisen from what I believe is a case of melted, (rather than dissolved) spice. If the spice is hot enough to begin to melt before dissolving it in NPS, is it safe to assume thats too hot? I'm assuming it is, based on what happens as it cools. But i would like to be sure I've made the correct assessment of an unsatisfactory procedure, so that the adjustments will improve the results. Basically I need to chose between lower solution temp with slightly more solvent, or insulating the thick viscous melted solution for slower cooling.

 

[Loveall]

I think that is correct: From experience, I think that if you melt DMT directly into an oil it will be difficult to get xtals from there. It may polymerize (form bonds with itself that keep it oily). I'm not sure, but I think that is what I have seen.

To break up this melted DMT and get xtals again an acid/base step may be required.

 

[Bisy]

Cool, thank you.