Ganzas (who I keep wanting to call Gonzo) is correct about the the antihistamines which cause the blue/green colors when vaporized being best removed before the precursor is reacted.
This is easiest done by boiling the psuedo/E in acetone and then filtering. Since meth is far more soluble in acetone than it's precursors acetone is not an ideal medium to separate these antihistaines after the reaction is done.
If meth is cleaned by boiling in acetone _alot_ of meth will go with the acetone so if it's done save the acetone and expect a massive decrease in end product.
But recrystalization is what will still make a vast improvement to the meth with the blue/green vaporization tendencies. There will still be some antihistamine that will recrystallize along with the meth but it'll will be far superior in quality than what you started with.
Post 498966 (https://www.thevespiary.org/talk/index.php?topic=8610.msg49896600#msg49896600)
(ChemoSabe: "Worlock's Response to a Similar Problem", Stimulants)
PS to Ganzas - when I see your name I now think of Ted Nugent's ancient double live LP which I now think of as "The Double Live Ganzas"