Ok I'm doing a thc extraction, I just washed some ground up herb 3 times with naptha and evaporated. Is it okay to smoke now? Or is further purification needed? And if it is, how do I go about doing that?

Well, given it's alright to smoke without extraction (and assuming it's properly evapped) I'd say yeah it's fine to blaze up. Although I will add you've probably extracted a lot of other marijuana constituents as well.

When I do thc extracts (not that I do very often, because I love the flavour of good old fashioned marijuana) my method is as follows.

Beginning with fresh leaf and popcorn buds, I extract using butane (thus avoiding the hassle of removing chlorophyll later on). Next I dissolve the resultant oil in a minimal amount of 100% ethanol (I make my own, isopropyl will work to), filter then evap. Then I wash the tar with warm water and allow to dry. Lastly, I dissolve the tar in acetone, filter again and evap under hard vacuum. The result is what I like to call honeycomb.

I would recommend cleaning it up more if you did not perform a vacuum purge. Naphtha evaps at a much slower rate and higher temp then butane. There is probably some naphtha trapped inside the extract, since it's a thick oil. It's different then evaping it and yielding crystals that can properly dry on their own.

Before smoking I would disolve it in something like alcohol or acetone, as this evaps better then naphtha and should allow residual naphtha to escape. Evap the acetone and then scrape it all up. You could then heat it up so it's runny and whip it, which will help get all the acetone out. At this point, it should be much safer to smoke. Just let it cool and harden up again and enjoy.

I would just get an extraction tube (my local glass blower sells them as dildos) and buy some proper butane. Blast the bud, evap with WARM water bath, and bam. (Vacuum purge if you want) but scrape and smoke after the butane is all gone.

I can't believe the glass blower markets blasting tubes as dildos....that's too funny!

Right? Walk in, "I need a dildo, dude" "how much should it hold?" (Other customer): "...?"

Another option in case you want to avoid butane is good ol' ethyl alcohol.

QWET Extraction with Alcohol

I've done this and it works/tastes great, and there is no concern about solvent getting trapped in the extract.

Ethyl is drinking alcohol right? If so green dragon tinctures are aaammmaaazing. Just make sure you decarb first.

Yep - 95% grain alcohol if at all possible. Check out the link, it's a great article.

By freezing well dried plant bits and using alcohol right out of the freezer for extraction, you pull only a minimal amount of chlorophyll-- the resulting flavor is excellent. The pulls are golden yellow with a hint of green.

Another benefit is that thc can be stored for a long time dissolved in alcohol without losing potency (just keep it out of the light). Small producers can effectively store their harvests for years.

If you don't want to consume alcohol and have the correct labware, use a dropping funnel to drip the tincture into hot glycerin. With suitable distillation apparatus the alcohol can be recovered. The high temperature also aids decarboxylation.

Safety note: Remember kids, don't go trying to evaporate highly flammable alcohol over naked flames! But I shouldn't have to say that, should I?

Green syrup can be quite devastating...