Ideally, water should account for 10.5% to 11.5% of green coffee weight. 1 If moisture content is too low, bean color is typically faded and the cup has notes of hay and straw. A roaster must apply heat cautiously to low-moisture beans, as they are likely to roast too fast. If moisture content is much higher than 12%, green coffee is prone to developing mold, and may taste grassy in the cup. Water slows heat transfer within beans, and it requires extra heat input to evaporate. Therefore, roasting the very moist beans requires extra energy, added time and roasting power. Rostino #coffee roasting machine
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