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Dark areas are areas that are last to freeze and therefore, are rich in both C% and alloy elements. This structure is named "dendrite"(樹枝晶) 暗影位置為最後凝固處, 其碳與合金/雜質元素濃度最高 (solute-rich area). 這種偏析, 只能靠均質退火 降低程度, 無法完全消除. 此區域內的晶粒會小於"亮處"(bright areas, solute-poor area)
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