Said crystals were tested and came up with flying colors via Mecke and Simon's Regeant tests -- MDMA. I've read through a ton of forum discussions on the topic of MDMA color. The consensus--from those that seem to know--is that: Pure MDMA is white crystals Brown or Amber color indicates impurities that were left before the final washes were ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.