Well....yeah like people said here,there is nothing new here,not any "sassa´s method" at all please!.the DCM wash of the acid water layer that contains the mdma.HCL or mda.HCL it´s for get ride off the intense colour the water layer usual presents on my extractions,posibly because i use and hcl excess with good amount water to make sure all mdma or mda migrates to the water layer.I used once to titrate exactly to ph 5-6 but to me it´s more tricky and time consuming.
Of course,if your water layer it´s clear not wash at all.Mine it isn´t,so if i don´t make that wash,i will need more acetone washing or recrystallization.Anyway,the product will be finally very clean.l
About that colour of the acid water layer that contains mdma,i don´t know since the begining what causes that.... but sure colour and intensity changes with hcl amount used....less hcl...orange/pinky water layer.....good excces:blood red,violet,......I suposse now t´s related to a little amount free amine because too much free hcl floating around?
....if it´s that,you guys are right when say i´m losting i tiny amount of mdma on that DCM wash.It´s all about time!...with my hcl excess i need that to get crystalls that are clean enough to make a single acetone wash and go directly to storage.
About mdma solubility on DCM i can´t show technicall data,but by bad experiences,i know gassing hcl on DCM when the salt it´s mdma doesn´t work!...posibly little solubility of mdma on DDCM andcombining little traces water with hcl floating around....Fuck up the crystallization way easier than on toluene....but gassing for MDA on DCM yeah it´s so easy it´s pleassure....so i think mdma it´s little soluble on DCM but doesn´t MDA.
And finally,the best method to evaporate the water layer if it´s acid like mine it´s a fan blowing directly over the water surface making turbulence,with the water layer on a flat crystal pan....I finished yestedary a batch that resulting on 500 ml water layer....today after 24 hours excactly,i have only litle wet crystalls,one day more will be ready to acetone wash.It´s the faster method i think.Remember cover hotplate stirrer,vacumm pump,....with plastic bags if are on same room....i´ve ruined one stirrer and pump because that...oxidation hurts!!.
The evaporation it´s quickly and you will finish with a crystal cover surface and water on the bottom that seems don´t want to evaporate....when i arrive to taht point,i scrape that crystall surface,stirr the crystalls with the remaining water and put againg the fan near....repeat that after you are sure the crystalls are dry.....and finally ...when you think they are dry....put under a low heat source(like a 60 w bulb) for one hour to dry it completly...that will make the finish acetone washing not take a lot of salt disoled on little water pressent.....and that´s all!.....
PD:we all have our "methods"...posibly lesrned by mistaking....so that isn´t a method at all..it´s the way i do things i works fine for me