Green Bean Consistency There can be a huge difference between a fully washed beans and natural- or dry-processed beans. The difference is usually found in the cell structure of the green bean, and in the resulting variance in heat resistance during roasting. Picture B. (page 35) shows a roasted, dry-processed Brazil bean with minor scorch and char marks on outside layers. Picture C. (page 36) shows the massive scorching that occurs when the same bean type is exposed to excessive heat in the first stage of roasting. This type of defect leads to burnt and acrid flavor profiles. The best prevention in this case is to always verify the green bean production process and, if possible, use your sample roaster to check the heat resistance of the coffee beans prior to roasting a full-size batch. If you suspect that the beans might be more prone to scorching, keep the charging temperature of the roaster as low as possible, without stalling the roasting process unnecessarily.