I think the solvent issue is somewhat overblown. It depends largely on how much oil you are taking and how regularly.
My understanding is that naphtha does not accumulate in the tissues of the body if ingested in small amounts. You don't accumulate the toxins with multiple doses over time, you excrete them.
So, by ingesting a grain of rice dose of the 5% naphtha contaminated cannabis oil, you are ingesting 1/20th of 1/20th of a milliliter of naphtha. This is .0025 of an ml, or 1/400th of an ml...or about 1/20th of a drop of naphtha. I don't know this but suspect that professional painters must ingest at least that much every workday. Come to think of it, painters can be a little strange at times.....lol.
Most patients don't have a lot of choices when acquiring cannabis oil. They must weigh this potential harm of the residual solvent against the potential benefit of this crude medicine, consider their ailment, and decide for themselves.
I did too at first. I saw a chart that showed naphtha decarbing was not the best but it did extract the most THCa. Now that I have learned that the THCa on an extraction will slowly convert to THC naturally,.naphtha could potentially extract the most THC based upon any comparison chart I have seen. I have never used naphtha because I am not confident that I would get 100% pure naphtha. Even if the container said it was, the potential is there that more than just naphtha is in it. Either way, it does make me uncomfortable to use naphtha so I have been using 99% isopropyl alcohol.
I have been taking so much iso oil over the last three years, it has started to concern me. Keep in mind, I am not just ingesting the oil, I am also vaporizing it (constantly). It is starting to concern me. If you 100% fully purge your product to where you 100% know, you have probably caused great damage to the oil. Mostly THC degrading to CBN.
Since it concerns me, I decided to do something about it. Switching to grain or organic 190 proof or higher alcohol. Yes, a recovery distiller would be great. To be honest, I just don't have the funds to invest, nor the time to research the best. Research is very important. It could cause serious damage to the oil not being able to see it in a contained unit (comparing to using a rice cooker). Normally I would, but this year has been difficult financially. So there is a simple solution. Do the initial extraction with 99% isopropyl alcohol, a nice gentle purge, get the oil done to where you like it, referring to decarbing. After the oil is done, put it back into the purge pan and dilute it with 190 proof or higher grain alcohol. Re-purge it, just be extra gentle with the heat. That is more than safe enough for me to ingest and vaporize for the rest of my life.
These pictures do not apply to what I spoke above. This oil I recently made 100% organic. I used 190 Everclear with a frozen extraction. I used my darkest heaviest chlorophyll strain. I did three rinses. I did not really use any heat. The oil is not decarbed. It was only made for smoking or vaporizing. I only vaporize the oil. My point of posting this is that it is not decarbed and you can use it in an e-cigg vaporizer and that produces enough heat to decarb the THC and you can feel the effects, relief, buzz. RSO decarbed works just as good. They are definitely different from each other though. Different in the buzz and taste. Both are very good for vaporizing. The only chemical that has been added so it can be vaporized is PG USP medical/food grade. You can buy it here: http://highdesertvap...lycol-(PG).html Just add a little bit to your concentrate with light heat to get them to infuse and you are good to go to vaporize in your favorite e-cigarette. I am puffing on my SVD vaporizer right now. http://michiganmedic.../#commentsStart
I just want people to know, make it yourself, it is so easy. I no longer smoke what so ever. I either let the vaporizer do the decarbing and enjoy the buzz instead of smoking a joint. Or I decarb the oil and ingest it and enjoy the buzz for many hours. Well, actually, I do both.
This is a QWISO style hash. I did customize it a little for my own experimental reasons. I must say the results are very impressive. It is so impressive I am considering spending $250-$500 on solvent to try out my next batch of RSO and have it all evaporate away using a rice cooker because I am so impressed with the QWISO style oil cam out using the 190 proof Everclear. I used my crappiest strain in the extraction. I will make some more QWISO soon and then I will decide if I will make my next RSO with grain or organic 190 proof or higher alcohol.
Happy oiling my friends!