SWIM wanted to test out his solvent (Kleanstrip VM&P Naphtha from Home Depot) to see if it was "clean". Tried a couple of evaps and noticed what looked like dirt at the bottom of his evaporating dish (after very little evaporation). So SWIM is suspicious. HOWEVER, SWIM doesn't notice "dirt" sinking to the bottom of covered jars of the solvent, so suspects this might just be dirt from the air.
Any thoughts on a good testing protocol?
Any thoughts on a good testing protocol?