Quote Originally Posted by grumio
I wonder if that little bit of oily film you'll see on the surface really is pure cannabinols... (pure-ish at least).
YES, it is!
Its pure hash oil... its the thing with the highest concentration of cannabinoids you could ever get from your weed! So whenever it appears, it must be re-dissolved, to ensure that all the cannabinoids remain in the solution, instead stickied uselessly in the jars walls.