It really seems to assist the process of aging. I keep a lid on during most of the process except for the actual use of the homogenizer. This way I'm not introducing oxygen and don't get discoloration from the nicotine oxidation. From what I can tell so far, actual "sitting" does still enhance flavor but a few days of sitting seems to be about the apex of change. Keeping the finished mixes in a filing cabinet drawer also helps minimize oxidation. Large batches will darken some just from long periods of time before it's used up.