Well now that's impressive !!,
looks like you got that one down pat !!

I was reading another tek here which involved freezing the prepared O' solution,
removing the ice then repeating the freeze process and removing the ice. plus once more,
then simmer down the thick solution in heatbath. Supposably you end up with very clean O'
Here's the link:
http://forums.mycotopia.net/showthread.php?t=8819 (Opium Poppy Teks)
Scroll down 4 some great pics !!