The word 'scarlet' entered English in the mid-thirteenth century from Old French 'escarlate,' which derives from Medieval Latin 'scarlata.' The ultimate origin is debated, but the most widely accepted etymology traces it through Arabic 'siqillāt' (fine cloth) to Persian 'saqalāt' (rich cloth, brocade). What is certain is that the word originally named a type of cloth, not a colour — and that this distinction illuminates a fundamental truth about how colour words evolve.
In its earliest English usage, 'scarlet' referred to a particular grade of expensive, high-quality woolen cloth. Medieval textile records attest to 'blue scarlet,' 'green scarlet,' 'white scarlet,' and 'black scarlet' — the word specified the cloth's weave and quality, not its colour. The finest scarlet cloth, however, was typically dyed with kermes — the brilliant red pigment extracted from the bodies of scale insects — and this association between the best scarlet and the colour red gradually caused the cloth-name to become a colour-name. By the fourteenth century, 'scarlet' in English could refer to the colour alone, independent of the fabric.
This semantic shift from material to colour is not unique. 'Purple' underwent a similar transformation: it originally named the specific dye extracted from murex sea snails (Tyrian purple), not the colour range we now call purple. 'Orange' shifted in the opposite direction — from fruit to colour. These examples reveal that colour vocabulary is not as abstract as it might seem; many colour words began as names for the physical substances or objects that produced or exemplified the colour.
The cultural associations of scarlet are among the richest of any colour word in English. In the Bible, scarlet appears repeatedly as a colour of sin, luxury, and royalty. The 'scarlet thread' of Rahab (Joshua 2:18) and the 'scarlet' of the Whore of Babylon (Revelation 17:4) gave the colour a potent moral symbolism in Christian tradition. Nathaniel Hawthorne's 'The Scarlet Letter' (1850) made the colour a permanent symbol of sexual transgression in American literature — Hester Prynne's scarlet 'A' has entered the cultural lexicon as shorthand for public shaming.
In ecclesiastical tradition, scarlet and red are the colours of cardinals' robes in the Roman Catholic Church — hence the phrase 'cardinal red.' The cardinals' scarlet vestments symbolize their willingness to shed blood in defense of the faith, though the historical reality is that the colour reflected the expense and prestige of kermes-dyed cloth rather than any original symbolic intention.
In military history, 'scarlet' is inseparable from the British Army. British soldiers wore scarlet coats from the seventeenth century until khaki replaced them for active service in the late nineteenth century. The 'redcoats' of the American Revolution, the 'thin red line' of Balaclava (1854), and the ceremonial scarlet tunics still worn by Household troops outside Buckingham Palace — all use the colour as a marker of British military identity. The original reason for scarlet uniforms was practical and economic: red dye (from cochineal and madder) was cheaper than other colours and, conveniently, did not show blood stains.
'Scarlet fever' — the disease known medically as 'scarlatina' (from Italian 'scarlattina,' diminutive of 'scarlatto,' scarlet) — was named for the vivid red rash that covers the patient's body. The disease, caused by group A streptococcal bacteria, was a major killer of children before the antibiotic era. The German word for scarlet fever, 'Scharlach,' derives from the same root as English 'scarlet,' demonstrating the word's reach across European languages.
In colour science, scarlet is typically defined as a red with a slight orange bias — warmer and more vivid than crimson (which inclines toward blue-purple) and less orange than vermilion. The three words — scarlet, crimson, vermilion — carve up the red spectrum with a precision that reflects centuries of dye-making expertise, each word naming a red produced by a different material: scarlet from kermes-dyed cloth, crimson from the kermes insect itself, vermilion from mercury sulfide or cinnabar.
Across European languages, the word maintains a consistent form: French 'écarlate,' Spanish 'escarlata,' Italian 'scarlatto,' Portuguese 'escarlate,' German 'Scharlach,' Dutch 'scharlaken.' The uniformity reflects the word's transmission through the luxury textile trade, which connected the medieval Mediterranean world from Persia to England.