I’ve done a few liquid liquid extractions on cannabis oil, and I’m not sure if they’re accomplishing what I want them to - improve color.
Process so far has been to dissolve oleoresin (1st pass distillate, EHO, etc.) in pentane (trying heptane currently), transferring to sep funnel, and washing with pH 4 brine (2x), pH 8 brine (2x) and pH 7 brine (3-5x) draining aqueous layer each time. My concern is that I see no color change in the organic layer in between washes. My aqueous layer always comes out clear (maybe a little bit of color if I pull too much organic layer thru). Is this normal? Is the point of LLE to remove the impurities via the emulsion layer more so than to actually extract the colored pigmented impurities into the aqueous layer?