The first explosion and so on means that the baker generally forms the default baking degree between the explosion sound and the baking degree.

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What does "explode" mean when coffee is roasted?

"bang" refers to the sound produced by the expansion of raw coffee beans after being roasted at high temperature. It sounds like "bang, bang, bang." The popping sound is just like popcorn, so it is called coffee bean "popping" sound.

The term "first explosion" and "second explosion" means that bakers generally form a default baking degree between the explosion sound and the baking degree, which can be used as a reference for adjusting baking. Because of the difference in hardness, density and moisture content of each bean, there is a difference between the lower bean and the baking. At this time, the burst sound combined with the data of the baking curve can assist the positioning of the baking curve after the test. so what we often hear professionals say is that this bean is a noun such as "the first explosion intensive period / the second explosion initial stage", rather than the light baking, medium baking and deep baking as we often say.... This is because bakers like to use a burst sound to locate the baking degree.

A burst is the sound of the first continuous burst. Uncle Dou did not make it clear when the coffee baking would stop after the explosion. I said an explosion is important. It doesn't mean it all stops as soon as it explodes.

To be exact, it can stop at any time after an explosion, depending on the degree of baking and taste expectations of the individual. If you need deep baking, you can pull to the second explosion, or even the second explosion dense.

From the point of view of the chemical change process of coffee, the conversion of sugar to caramelization in coffee starts and the flavor oil is formed, so this is very important.

[secondary explosion] after a second explosion, some of the components produced begin to decompose while heating. In this process, gas is produced, which causes the beans to continue to expand. With the expansion of coffee beans, the cells are destroyed at one time, followed by a crackling sound. This is the so-called "secondary explosion" and "triple explosion". This change will not stop until the coffee beans are removed from the roaster and forced to cool.