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For fellow drinkers of #coldbrew #coffee: here are 2 v important charts from a food science journal showing how efficiently #caffeine is extracted. As I learned early on, it's deceptively easy to consume an unpleasant amount of #caffeine using this brewing method. 
1. Caffeine concentration begins approaching steady state after about 400 minutes (6 2/3 hours). If you think that a 7 hour counter steep will avoid most of the caffeine ... this is wrong. You've extracted almost all of it at this point.
2. While cold water extracts caffeine less efficiently than hot brew methods, this is more than compensated for in cold brew by the much longer time the grinds are in contact with the water.
