fizzing E?

[magica]

Can anyone tell me what it means if a pill tests to dark purple in 10 secs, but then begins to fizz little bubbles?
What does the combination of purple and bubbles mean?

 

[aj]

It fizzes after it went purple ??
Normally, _pure_ mdma might fizz a bit when the liquid hits the scraping, then it goes purple. Fizzing after going purple is new for me. It could be the binder though....??
Anyone ??
aj