Hello Riz
I would say for HR reagent test is highly advised. Essential really.
For sniffing out a inert cut it unfortunately falls short. Personally I would say brown and white crystals mixed is not a good sign.
Sourcing white inert crystal for cutting is awfully easy. Getting offish brown cut is slightly more tricky but also possible.
http://www.ebay.com/itm/Aluminium-P...1614354316560294073&pid=100033&prg=1020&rk=3&
MAIN QUESTION: is it possible therefore to have crystals of a white clearish colour in the same batch of md (ie. one that's predominantly brownish white in colour)
Anything is theoretically possible but in reality this would be less likely. Assume a profiteering cut.
The brown colour in the MDMA indicates an impurity. In most cases the browney tinge is caused by the Ketone MDP2P which is usually a thick yellowey liquid. Another possibility is when one of the more popular synthetic routes involving the Reductive Amination Route MD-P2P>MDMA. It mixes and makes a dark brown sludge.
Below are images of both MD-P2P (AKA PMK) and Nitromethane (sorry i cant direct link to these pics as there embedded with synthesis recipes) (their easy to find with google + loads more info)
http://www.4shared.com/photo/ntvU4H-d/MD-P2P__Nitro.html
Below - Once this chemical reaction completes the Contents gets mixed with Nitromethane forming a Deep Brown Sludge loads of more info about this on google ;-)
http://www.4shared.com/photo/022SOj-_/MDMA_Brown_Sludge.html
Below - Xylene or equiv is then added forming a Seperation Layer
http://www.4shared.com/photo/yiAiscvk/MDMA_Brown_Sludge_Seperation.html
In many cases it is the process of removing and cleaning this seperation layer that influences the brown colour of the MDMA powder.
The final product can range from Dark Brown/Light Brown/White depending on the amount of impurity left over from this brown sludge.
The seperated product is then formed into a salt likely HCL using Hydrochlic Acid but other salt types are sometimes formed such as acetates and phosphates. To make a different salt type a different acid type is used. Debatable but some say the different salts effect the high of the MDMA. PLease come to "Pills of the 90s" if you want to debate this.
Picking up on your comment
0.8g baggie of unadulterated, chunky; smooth brown tinted crystals. Mothafuckas this shit was the bomb.
Like yourself many users like brown MDMA. Its easier to spot adulterants, many say that the impurities make for a heavier and more full on buzz.
White if not cut is clean MDMA powder. To get white involves more extensive filtrations and several cleaning processes.
Sometimes if you want white MDMA as Dmytry points out you can clean using Acetone (nail varnish remover)(paint thinner) be sure to buy non hydrous acetone ie it doesnt contain water. Otherwise your product will dissolve.
Depending on the impurity the acetone wash will not always clean the crystal to white. If this is the case you have to dissolve the salt back to liquid, clean and recrystalize if you want white perfection.
(Any of you who have experience using a white crystally md - hearing your experiences would also be propitious to me.)
Tried it. obviousley no impurities. Less heavy than brown MDMA, more mellow, clearer roll, cleaner comedown. Not to everyones liking. Many prefer dirty brown.
Obviousley light brown sits somewhere imbetween white and dark brown in terms of filtration and cleaning.
Sorry for the lengthy post. Hope this helps you out in some way.
Futura