Brazilin is a red pigment obtained from the wood of the brazilwood family (Caesalpinia sp), and is also known as Natural Red 24. Brazilin has been used since at least the Middle Ages to dye fabric, and has been used to make paints and inks as well. The specific color produced by the pigment depends on its manner of preparation: in an acidic solution brazilin will appear yellow, but in an alkaline preparation it will appear red. Brazilin is closely related to the blue-black dye hematoxylin, having one fewer hydroxyl group. Brazilein is the name for the oxidized pigment.

CAS：474-07-7
中文别名：苏枋精;巴西苏木素,巴西木红素;巴西红木精;
英文别名：superbresiline;BRAZILIN;braziletto;pernambucoextract;brasilin;limawoodextract;hypernicextract;
分子式：C16H14O5
分子量：286.279
精确质量：286.084
Psa：90.15
Logp：1.6149

UNII：FZ39SW1K10

密度：1.604g/cm3
沸点：555.8ºC at 760 mmHg
熔点：156-157ºC
闪点：289.9ºC
折射率：1.774
蒸汽压：3.44E-13mmHg at 25°C

用途
测定铁的试剂。酸碱指示剂,pH5.8(绿光黄色)～7.7(深紫色)。植物标本的染色。细胞核染色。