Hello.
I would stick with the naphtha. It's a proven solvent.
Warming it up and swirling/mixing in your decant jar/flask will break everything down and when it cools, the heavier particles will settle to the bottom, leaving you with a purified solution you can decant into another jar/flask. Then you can evap or freeze precip.
Depending on the color, might have to do this more than once, but really should be fine one time.
Happy explorations!
"We speak of Time and Mind, which do not easily yield to catagories. We separate past and future and find that Time is an amalgam of both. We separate good and evil and find that Mind is an amalgam of both. To understand, we must grasp the whole." -Isaac Asimov
"You will not be punished for your anger, you will be punished by your anger." -Buddha
"I must not fear. Fear is the mind killer. Fear is the little death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when my fear is gone I will turn and face fear's path, and only I will remain." -Paul Atreides, while being tested with the Gom Jabbar by the Reverend Mother Gaius Helen Mohiam