? Solvent added (clear) to compound (orange) in first vessel to give compound solution (orange) ? First vessel is placed in a second vessel contain second solvent (blue). The second vessel is sealed, the first vessel is also sealed, although a small hole in the first vessel is present. This hole allows volatile solvent vapour (blue) to slowly evaporate from second vessel and condensate (that is infuse) into the first vessel, to give a mixed solvent system (green) ? Over time this gives crystals (orange) and a saturated mixed solvent system (green-blue).

Takes forever though.  They usually don't do this unless they're crystallizing proteins or some ridiculously hard to crystallize structure.  Awesome crystals though

in the spirit of sharing :
I have only experience with MDA.HCl, not with the MDMA. With MDA the beautiful transparent crystals are hydrates! In my experience recrystallization from water works super well and yield is over 92% for me in repeated experiments, carried in 120g scale.
Procedure -
I heat water in an earlenmayer or other wide mouth flask in the oil bath.Make sure the flask is completly covered in oil so that there wont be any areas which will cool faster then others. once temp is around 95degC I start adding the MDA.HCl powder. once all the mda.hcl is in solution  i start powering down the heating slowly, in general the longer it takes to reach toom temp and the smaller the temp differential over time, the better the crystals look. for me about 5 hours to reach room temp is adequate. After that I stick in the fridge at 4degC for a couple hours more. If you add a seed crystal (obtained by slow evaporation as described above) when the solution is hot and saturated, you will get a very similair crystal growth, only in huge chunks!
What you get is a single huge crystal, mostly transparent or barely non transparent. usually requires breaking it, unless the neck of the flask is as wide as the bottom.
Ive found that around 28-30ml of water dissolve 64-65g of MDA.HCl at boiling.
Mind you, my MDA.HCl is a hydrate to begin with, so your solubility if you prepare your salt from anhydrous solvents might be different.
This is the best way to produce the large clear chunks of crystal.
Im sick now and in bed, and the photos are in the other PC. I will u/l tomorrow a few of them to show you what you get when you recrystallize from water.
The spent liquid, which still contains a small amount (~5-8% of the inital salt), I simple pour onto a large dish, let evaporate, scrape and add to the next batch of recrystallization. This way there is minimal loss of material, Id say around 1% over many runs, and the product has a great eye candy appeal.

On another subject, I preapre the actual salt by dissolution of the MDA base in methanol, drip in stoichiometric amount of conc. aq. HCl while cooling in the ice bath, then I rotovap most of the methanol off with good vacuum (bath temp at ~50degC) and pour the remaining liquid (which by now contains a visually detectable amount of pure white tiny crystals) onto a very large dish and set aside in a dark place for 2-3 days, i scrape it and swirl it a few times during, and in the end get big nice chunks of hydrated MDA.HCl salt.

  Jon:glad to read your comments  again !! ;)I see you still rolingl hard.... .  I think if i eat 1 gram mda on a shot i will be go directly to the hospital...or to heaven....or to hell!!....of course...i think i couldn´t sleep on days!
    About things you comment on another post,,,,i didn´t prove the smoked freebase,,,but yes the mda Hcl on a cigarrete several times,,,and not doubt at all it has an extraordinary,quickly and plenty of power high!!
 But refering to this post,i have to say I´m digging  a lot  Letters ´s words! .
   Seems it can be a real solution to the question.Some photos of the final product after seeding with the crystal and chunk formed would be great of course!!.
  I have to experiment with that.
  Letters,do you think if you add the 30-35 % weight of lactose-cellulose-manitol when you are disolving the mda on the near boiling water,the result will be the same ,with the sugar catched into the structure,or will fuck up the crystallization on a big chunk of that mda?.Like said,95% production of ducth labs think it´s mdma(rarelly mda ),and know mdma can form 1-2-3-hydrates isn´t it?...so maybe it´s posible it´s the way they do it!
  I have seen too that mda forms pretty big crystals from evaporation with water,less shiny and pretty from methanol.Since saw that,i usually do with methanol to mdma,water directly for mda..
   Pd:i have to say(if someone it´s thinking it), i don´t planning adultering anything for weight purpose ,,,I´m planing really on taste the diference between pure salt and salt asociated-combined with lactose-manitol....Sounds stupid,,,but i think it´s posible it will be diferrence....

im sorry guys, but in my flu haze i forgot i deleted all pics from the harddrive, and the crystals are all gone. the method good works as long as you let it cool slowly.
make sure your water is at least deionized (higher quality is better) and of neutral ph.
ive tried numerous recrystallization solvents (and solvent pairs), as well as slow evaporation from several solvents. in my experience for purification purposes the solvent pair isopropanol/hexanes (or pet ether 60-80) works best. return is as high as there is pure material. dissolution of salt in as little ipa as possible while boiling. once all in solution remove from heating, let cool just a bit and pipette ~10% hexanes by volume in comparison to the ipa. let cool to room temp and stick in the fridge for a few hours. the salt precipitates as very clean tiny crystals, looking like shiny powder. ive used this pair to clean up non distilled salted base. depending on how dirty your salt is one or 2 recrystallization are enough. HOWEVER, IT IS ALWAYS BEST TO DISTILL YOUR BASES!
If your salt is clean to begin with, there is no need for this ofcourse!
ive never added anything to my product just because i never felt the need to. ive never tried adding mannitol. ive thought about lactose but been weary about it cause some people are intolerant to it.
so adding 20% by weight mannitol to the aq. solution will make it crystallize quickly even when hot? but then how would you mix it before it crystallizes?

"""......I just wanted to mention this...because crystal does not equal purity....""""
  Thats one of various  thing because this thread it´s interesting to me,because the controversy about all the people talking about the imposibility to the racemic mdma and mda to make those big crystals,and on the other side,what we found and what we see when are talking about   street drugs.
   I have read a lot of disccusions about if found so big crystalls-chunks  are indicative of adulteration(filling) or indicative of pure product,and seems anybody seemed  can´t explain how make the labs those big chunks,
   On another hand,i don´t believe that putting 20% of mannitol,a simple sugar, on our finnal product if that can make the crystallization process much more quickly and easy,can be considered  cutting the product ,as can happens when you have to buy something to a dealer and man...THAT SHIT....it´s what i considered cutting the mdma.
   It´s posible some people laught about that,...but some nights,it  would be not bad to have a product on your hands that wasn´t  99% pure,because it´s easy to  roll excesive.It happened to me sometimes,and more  to a friend of mine,that since was used to the street mdma,when a gave it some 99% ,advising about the purity,it finish the night totally fucked up.It´s easy to lost control with a substance on 99% purity.So a 80% purity can be a good alternative,ever when that 20% it´s  not a dangerous filler.
   I don´t know how you consume your mdma.For example,I and my circle,use to pick little amounts by wet a finger and eat a little quantity ,until we considered we are rolling enough.
   When you handle 99-100% product,it´easy for the inexpert (and to me of course if i´m drinking alcohol),to go to the great loving high .....to the "totally fucked up with crazy face high" on 30 minutes.
   So,since i´m out of the lab work this weeks,and can´t experiment by myself,it would be interesting know how to make that 80% mdma 20% manitol.
  TO JON OR ANOTHER WITH PRACTICAL KNOWLEGEMENT ABOUT THAT:Of course i have some mdma hcl and mda hcl to experiment,but not mannitol at this time.Since i´m out of lab work this weeks ,i  wish to read how to procced on future, and what are the results.Suppossed to make the saturated solution like always but with 80% weight of mdmda and 20% mannitol and let evaporate slowly like ever?and what about cristallization time,potency,aspect,smell,taste,...related to pure mdma or pure mda?i´ve heard mannitol taste to menthol,,,but of course it isn´t a problem to me at all.Thank´s

http://127.0.0.1/talk/index.php/topic,1950.new.html#new

We are discussing the method of growing a large crystal with MDMA, not anything else.

Quote from: jon on April 12, 2011, 12:31:10 AM

sassa if you add about 20% mannitol to get it to crystallize faster you really don't notice and it's not really about increasing profits it's more about getting the shit out the door as fast as possible rather than having a load of incriminating evidence sitting around crystallizing for days.

jon, do you know why mannitol makes it crystallize faster?  That's something interesting I've definitely never heard of

also if you add mannitol will a slow alcohol reX create one large xtal or does it work best from acetone/h2o?

Found this image on Charlie Sheen's droid...

1.1g MDA.HCl Super Crystal Chunk 

Went transparent/tan when crushed. Extremely pure. Faint licorice/sass rb smell.

Oh Charlie... 

Namaste

  wow charlie sheen is doing some dirty MDMA.