Do you think it's safe to ingest that oil? I mean just for the fact that you use ISO? I was under the assumption that grain alcohol would be better. If I'm wrong please tell me because I want to try this.
Yes and no. I have a patient that has continuously taken the oil for three years now. He did go through the full Rick Simpson treatment taking on gram per day for 6 months. He has yet to complain about any adverse effects from taking oil that was made with medicinal quality buds and ISO.
I do know of somebody that did test some RSO made with iso. The tested for residue/contaminants and no evidence of iso was found whatsoever. Northern Labs discussed the test results. He is from Michigan.
Now if the oil is not made correctly and all of the solvent is not purged out correctly, well, I am sure it could make someone ill.
The lower the quality of material used, the more iso is required per gram of concentrate. Also, all the more chlorophyll and other contaminants that could be in the product. In other words, you would have to use a lot of product, if it is low grade (a large amount of product), to make a small amount of RSO. That could be a little bit concerning.
High quality buds and maybe a little sugar leaf, preferably all organically grown, bone dry, no pesticides. It should be perfectly safe as long as all of the ISO is purged out.
The key to purging out the ISO is patience. When I use my coffee cup warmer, which is used at the final stage of purging the solvent, I will add some pennies or quarters in between the metal cup and the cup warmer to reduce the risk of overheating the oil. I don't mind spending extra hours purging. It it is time for me to go to bed, and it has been purging for 4, 6, or 8 hours, I will shut it down, allow it to cool. Then slip a baggie over top to keep the dust out. Then in the morning take off the baggie then turn the warmer back on and purge it until it is finished. The key is patience and not overheating the oil during the final stage of purging. Occasionally stirring it around is good too while it is purging. Only use 99% isopropyl alcohol, order it online if you have to.
Keep in mind, with top shelf meds converted into RSO, you only need to take a dose the size of a grain of rice, up to about a pea size if you really want to feel it. There can't be that much iso left over if a grain of rice size dose can get you off for many hours.
Grain alcohol, you can order it online if you cannot purchase it in your state. I recommend nothing lower than 190 proof. That is perfectly safe. I have not done it yet, but I would like to. It will be a little less efficient, but should do pretty good, just quite expensive considering the cost of the grain alcohol, and possibly less potent.
Personally, I do not recommend naphtha, I have just been hearing too may bad things about not using the right kind and other issues.
RSO is different. I hope you do try it.
Edit: Most importantly: Safety First! When it comes to the rice cooker, do this outdoors ONLY, well ventilated, with a fan, and NO SPARKS. Common sense. Many other solvents can be used, and may be better for the end product, but with a high cost. Most are much more flammable and have a higher potential to cause a fire or an explosion.
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...Back on track we go! These shots are unedited, and not the best...but my camera is dead, and I can't take pics of todays pickup yet (Jack the Ripper, Ogre, and Northern Lights X Super Silver Haze) So these pics, are from the last pickup of Ogre...to stay on topic 
