If you use any solvent other than pure grain alcohol, you have to make extra sure to get all of the solvent evaporated. Which just requires adding a little extra water near the end to ensure there is no solvent left. The closer to the boiling point the solution gets, the less solvent that is left in the oil.
Just remember that the alcohol fumes are flammable! So plenty of ventilation is recommended. I do it outside.
After decarbing, I soak it in alcohol for a couple of days in the freezer before starting the actual extraction process.
I use an old crock pot and keep the lid canted to allow the steam to flow out. A wooden or plastic spoon works well to put under the lid. I've had it pop back down with out something to keep it lifted a bit.
I've made it, both with and with out Lecithin. My latest batch was with out and it is not as strong as it normally is. So all future batches will have the lecithin added. That's just my experience with it. Your experience may be slightly different.
Evaporating a little extra water off is better in my opinion than having to add water back because it went too long and dried out completely. Again, that's just me.
good luck!
