Debunked - Do Espresso Shots End?
http://coffeetipsk027.raidersfanteamshop.com/espresso-misconceptions-does-espresso-go-bad-after-10-seconds
Crema is the layer of foam that usually sits on top of an espresso that has actually just been pulled. The common guideline in coffee making is that when the crema vanishes from an espresso, the shot is dead. Hold