A harsh sour taste and tartness. An acrid coffee can be described as tart, sharp, or acerbic.
Whenever the coffee smell or taste similar to an ashtray or fireplace, it is called "Ashy". Ashy aroma indicates a dark roast, and is not necessarily a negative attribute. Ashy coffees generally have a carbony flavor.
A dry, sour, salty, and generally disagreeable sensation detected mostly at the sides of the tongue.
It is normally described in light roasted coffee with mild flavor. The taste characteristic of coffee stored too long in burlap bags, causing the coffee beans to acquire a straw-like coffee bag flavor.
It is a dull, and uninteresting coffee. A baked flavor may be caused by roasting too slowly. Coffee roasted in a drum roaster for much more than about 17 minutes will likely be burnt or have a baked flavor.
A balanced coffee does not have any overwhelming flavor or aroma characteristics.
If a coffee has flavors that can be sensed evenly across the tongue, it called balanced.