logwood

Logwood is a straightforward English compound: log + wood. The tree (Haematoxylum campechianum) was named for the logs cut from it and shipped to Europe as dyestuff. The heartwood produces haematoxylin, a compound that yields black, purple, blue, and gray dyes depending on the mordant. No other natural source produced a true, lightfast black as reliably as logwood.

The Maya used logwood for centuries before Europeans arrived. The Spanish found the tree concentrated around Campeche, Mexico, and began exporting it in the 1500s. Spain claimed a monopoly on the trade, but English woodcutters—the Baymen—established illegal logging camps along the coast of Belize starting in the 1630s. These camps eventually became the colony of British Honduras.

The Battle of St. George's Caye in 1798 was fought between Spain and Britain over logwood territory. Britain won, securing Belize. A dye tree shaped the political map of Central America. Meanwhile, logwood became the standard black dye for European wool, silk, and cotton. Every black naval uniform, every academic gown, every mourning dress of the 18th and 19th centuries was likely dyed with logwood.

Haematoxylin found a second life in medicine. In 1863, German pathologist Heinrich Waldeyer discovered that haematoxylin stains cell nuclei a deep blue-purple, making them visible under a microscope. H&E staining (haematoxylin and eosin) remains the most widely used staining method in histopathology. The dye that colored navies now colors every tissue sample in every hospital in the world.