I have a lot of naptha in a jar and have been trying to freeze precipitate the contents. Problem is I believe I have too much naptha and want to try to evap half of it. I was thinking a crock pot with a little bit of water set to low or medium might be ok, but im worried about heating it too much. How can I go about evaporating maybe 100-150ml of naptha in a day or two without causing problems?