That would be the test to me - clarity. Alot of times Brulosophy serves the tasters in opaque cups - they say so. When they do, that eliminates any test for clarity.Brulosophy recently reported on an experiment they did--split the wort before the boil. Skimmed half and didn't skim the other. The results of their three way blind tests was the tasters could not tell the difference. After fermentation clarity was the same. So, it doesn't matter if you do or if you don't.