Solvent extraction of asphalt - GIF

Solvent extraction of asphalt.

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Previously:

https://www.homemadetools.net/forum/...557#post143107
https://www.homemadetools.net/forum/...802#post133311
https://www.homemadetools.net/forum/...884#post140481
https://www.homemadetools.net/forum/...423#post166204

why?
why are they doing this? is it for recovery? science demonstration, getting the word count high enough?

I'm guessing a quality analysis of some sort.