If you heat the naphtha, you may get other stuff, such as plant oils, with it. Heating is usually not necessary. Maybe heat the very last pull, but it will need a lot of re-xing.
To get the crystals: drain off naphtha, put the jar back in the freezer upside-down with the lid on bottom. The naphtha will drain to the lid. Remove from freezer (keeping lid on bottom) and take off lid over sink. Your spice is now free of naphtha. Let it sit in a dry area overnight. I have never noticed much degradation from using a fan though... if you are in a hurry to dry a dose or two. But, yes it is true that it degrades into dmt oxide.
Peace and congrats on the successful extraction.
With a bit of luck, his life was ruined forever. Always thinking that just behind some narrow door in all of his favorite bars, men in red woolen shirts are getting incredible kicks from things he'll never know. - Hunter S. Thompson