I was taught this at an industry conference on tea but I just did a Google search and it looks like recent research shows this to be false. Sorry for spreading bad info!
Quick tip: steep tea for 30 seconds and then discard that water and steep again for 30 seconds longer. 99% of the caffeine will drop in that first steeping.
apbailey t1_jdy5vmy wrote
Reply to comment by kuchenrolle in TIFU by drinking black tea by monkshood_bezoar
I was taught this at an industry conference on tea but I just did a Google search and it looks like recent research shows this to be false. Sorry for spreading bad info!