What is chaff in coffee roasting?

Chaff is a natural by-product of the coffee roasting proces.  Chaff is discarded skin or the hull of the coffee bean and is dislodged as the coffee beans are roasted.When coffee is roasted, the papery chaff is removed and discarded.  Chaff is very light, will blow...

The Sound of Coffee Roasting

A word about Sound and how it relates to coffee roasting: Sound is a good indicator of bean temperature during roasting. There are two temperature thresholds called “cracks” that roasters listen for. At about 200–202 °C (392–396 °F), beans will emit a...