A dual solvent recrystalization/single solvent plus some piracetam is what I had to do to experience something identical to the old school MDMA feelings we all love and cherish. It was an enlightening and therapeutic experience. Onset for my best MDMA experiences have always been 2 hours for some reason.
Fast metabolism, 60kg male 26 years old, 11 Years of experience with MDMA/ecstasy, Always reagent test my products before consumption.
The crystals I ended up with after the purification were like clear shards of ice from a freezer or sharp bits of broken glass perhaps. I'd say by-products and contaminants/probable adulterants may be the cause of the physiological and psychological feelings not being the same as they used to be.
It may be worth others investigating into dual solvent recrystalizations and single solvent washes to test this theory because to me I knew what I felt was identical to how I felt years ago. Providing you have a grasp on basic chemistry for personal consumption I think it's fine.
To break things down this is what I did. Although I highly encourage looking up a proper guide on purifying your MDMA. I feel as though have missed some crucial details and it would be dangerous to follow my guide but it was a rough explanation.
-Bake epsom salts in the oven for a certain duration and collect the anhydrous magnesium sulphate (cannot recall the temperature nor duration as it was too long ago, All I do remember is the temperature was hot and it was baked for a long duration). Here is a youtube guide
https://www.youtube.com/watch?v=IhE6CM6Qbws
-Add the product you're left with "desiccant" to some acetone to ensure all H20 has been removed from the acetone.
-After a day or two filter out the acetone with non bleached coffee filters or pipettes so ensure no desiccant is filtered through.
-Pour acetone over your MDMA to wash away any impurities, I performed this multiple times and ended up with a powdered MDMA which was white in color.
-Now to recrystallise the MDMA it needs to be dried and added to a beaker with anhydrous isopropyl alcohol (Can be purchased from a pc store/IT store)
-Break off the end of a matchstick and add it to your MDMA powder and isopropyl alcohol mixture to prevent the liquid from superheating, (proceed to heat up this mixture)
-Heat until all MDMA powder is fully dissolved then slowly start reducing the temperature of your hot plate/burner/heating device.
-Cool down slowly for larger crystals to form and ensure all isopropyl alcohol has been evaporated and cleaned prior to consumption or cool down quickly for smaller crystals. (I slowly reduced the temperature and after it was taken off the hot plate on the stove I set it on my heater to form larger and clearer crystals.
Edit after reading the MDMA report on erowid I can confirm the MDMA after the duel solvent recrystalization was nearly identical although his ability to describe the experience would be far beyond my capability of putting that into a report so thoroughly.
I'd have to make an errowid report next time I decide to wash my product. Last consumption was a month or two ago. Would like to give it at least another few months before another experience and put together a comprehensive report of the night/experience.