一種主要以針鐵礦(氫氧化鐵)和黏土製成的天然黃土礦物顏料。黃赭以天然型態存於世界各地,自史前時代就被當作顏料使用。而合成製造的氧化鐵黃色顏料稱為「馬爾斯黃(Mars yellow)」。A natural yellow earth mineral primarily composed of goethite (iron hydroxide) and clay. Yellow ochers occur naturally throughout the world and have been used as a pigment since prehistoric times. Synthetically produced yellow iron oxide pigment is called "Mars yellow."