深茜红是一種
紅色的染料，利用一種名為
茜素的紅色有毒有機物質而製成的顏色。By 1804, the English dye maker George Field had developed a technique to lake madder by treating it with alum. This turned the water-soluble madder extract into a solid, insoluble pigment. This resulting madder lake had a longer-lasting color, and could be used more versatilely, for example by blending it into a paint. Over the following years, it was found that other metal salts, including those containing iron, tin, and chromium, could be use in place of alum to give madder-based pigments of various other colors.
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