Flame test is basically passing the extract through a flame to see if it crackles, pops, or flares up at all. This will tell you if there is any moisture or solvent left in it for the most part.
Stew I'll hit you up, I've never done a butane extraction. The youtube videos and some reading on here is how I learned to do my alcohol extractions, and then just started tweaking, and trying to make improvments. There are several threads here about BHO, I don't see the point of butane to be completely honest( please no body needs to jump down my throat for this). Working with an expensive, usually impure, explosive gas seems unnessecary when I get the results I do from cheap ass 91% iso alcohol. I've used 99%(but can't find it anywhere anymore), and I've used 95% grain alcohol. If the grain alcohol was cheaper I'd use it all the time, but the ISO wins out. I can get a gallon of 91% Iso for about $10 were a gallon of grain alcohol would run much higher. I would say I use about a half a quart of alcohol for every half oz of material. Anyway I'll quit rambling and just pm you.....