I finally used up my last 100mg/ml from 2016 and pulled my first bottle from my 2016 vapepocolipse stash purchase out of the nic freezer and mixed it down to 20mg/ml. Clear (both concentrated and mixed), no odor, and it tested to 20mg/ml. 132 bottles left which calculates me running out when Halley's comet will be in perihelion again on my 101st birthday. (my final bucket list item)