Cochineal Insect

Dactylopius coccus — the cochineal insect — is one of the most economically and culturally significant insects in human history and the source of the carmine red dye used in food, cosmetics, textiles, and art for over 2,000 years. The species is a small scale insect (3-5 mm) that lives exclusively on prickly pear cacti (Opuntia and related Cactaceae) of Mexico and South America. Adult females are wingless, sessile, and covered in a white waxy secretion (the 'cochineal scale'); they spend their lives attached to a single cactus pad, feeding on cactus sap with stylet mouthparts. The species produces enormous quantities of carminic acid (15-25% of body weight) — a brilliant red anthraquinone compound that serves as a defensive chemical (predators that bite the scale are deterred by the bitter compound). The carminic acid is harvested by collecting the scale insects, drying them in the sun, and grinding them to a brilliant red powder ('cochineal' or 'carmine'). The Aztec, Inca, Maya, and other pre-Columbian Mesoamerican civilizations cultivated cochineal on prickly pear plantations for the dye, used it to color royal textiles, ceremonial objects, and codex manuscripts, and traded it throughout Mesoamerica. After Spanish conquest in the 1520s-1530s, cochineal became the most valuable single trade good in the New World after silver and gold; for the next 250 years (1530s-1780s) Spain enforced a brutal monopoly on cochineal export from Mexico, and the dye colored the red textiles of European royalty, the British military 'redcoats' (later partly substituted), and the Catholic Church's cardinal robes. Modern production is ~200 tons per year, primarily from Peru, the Canary Islands, and Mexico; carmine is widely used as natural food coloring (E120 in EU labeling), in lipsticks and cosmetics, in watercolor and oil paints, and as a histological stain in microscopy.