"Leaving coffee in the French press is actually a big no-no. According to Matt Woodburn-Simmonds, Ex-Barista and Founder of Home Coffee Expert, you should never leave coffee in your French press since the coffee grounds continue to extract as it sits. "If you leave it there, then all the super bitter flavors that you don't want in your brew will be drawn out making a very harsh and bitter cup of coffee," the java pro told Tasting Table."
"Besides going cold and over-extracting the coffee grounds, room temperature coffee also tastes bad because of chemical reactions that occur as it sits, like pH changes, oxidation, and the development of bitter aromatic and taste compounds. To prevent astringent bitter flavors from developing past the first cup, Woodburn-Simmonds recommends transferring extra French press coffee to a thermos. This keeps the brew hot but not in contact with the grinds underneath the coffee maker's plunger and sieve, so you won't risk your coffee developing off flavors."
Leaving brewed coffee in a French press causes continued extraction from the grounds, which draws out harsh, bitter flavors and makes the cup astringent. Room-temperature coffee also develops undesirable tastes due to pH changes, oxidation, and formation of bitter aromatic and taste compounds. To prevent off-flavors after the first cup, transfer extra French press coffee to a thermos to keep the brew hot while removing contact with the grounds and sieve. Alternatively, use different-sized French presses to brew only the amount needed and avoid over-extraction or the need to decant the coffee to preserve flavor.
Read at Tasting Table
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