Scarlet
Scarlet color is a bright, orange-leaning red, named after a fine medieval cloth rather than a shade. Kermes and cochineal dyed that cloth red; today it is mixed from pyrrole and cadmium pigments.

What color is scarlet?
| Hex | #FF2400 |
| RGB | 255, 36, 0 |
| CMYK | 0, 86, 100, 0 |
| Warm or cool | Warm. It carries orange rather than blue, which is why it jumps forward on the page where crimson sits back. |
| On the wheel | A red pulled toward orange, about a quarter of the way from red to orange on the wheel, and just a touch less orange than vermilion. |
The story of scarlet
Scarlet started out as the name of a fine woven cloth, not a color, and the cloth was usually but not always dyed red.
The word comes from the Persian saqerlat, by way of Latin scarlatum and Old French escarlate, and it named a high-quality wool cloth traded across the medieval Mediterranean. English picked it up as scarlat by 1250. Only once the cloth became linked to one particular red, the one dyed with kermes, did the word settle into meaning the color rather than the weave.
Kermes dyed that cloth first, the same insect that gave crimson its name, gathered from oak trees around the Mediterranean and traded from Persia to Rome. Cochineal arrived from Mexico in the 1500s and did the job better and cheaper, and within a few decades almost every fine scarlet garment in Europe was dyed with the Mexican insect instead of the old Mediterranean one.
Cardinals wear scarlet, not purple, though the phrase raised to the purple still means made a cardinal. In 1295 the church put its cardinals in red robes, but the shade was close to the imperial purple of Byzantium, made from murex shellfish. Only after Constantinople fell to the Ottomans in 1453, and that purple dye disappeared from the market, did cardinals switch to a scarlet dyed with kermes instead. The name for the honor never caught up with the wardrobe change.
England's soldiers were scarlet too, at least the officers were. The New Model Army adopted red coats in 1645 and kept them, in one form or another, until the First World War. Ordinary soldiers wore coats dyed with the cheaper madder; officers wore the true scarlet, dyed with the costlier cochineal, which is where the nickname redcoats came from even though only some of the coats were the expensive shade. After 1873 every rank finally got the brighter, cochineal-dyed scarlet.
Nathaniel Hawthorne leaned on all of that history without spelling it out. His Scarlet Letter, the A that Hester Prynne is made to wear, works because scarlet already meant guilt and display before he wrote a word: the color of cardinals and kings, worn now as a punishment instead of an honor. Paint it today and you reach for pyrrole red or cadmium red, both synthetic, both indifferent to whichever institution is currently wearing the color. Scarlet has dressed clergy, armies and adulterers inside the same three centuries. I just like that it goes on so cleanly.
Pigment facts
| Colour Index | Not a pigment. A color name, historically dyed with kermes or cochineal and painted with vermilion, ground from cinnabar or mercury sulfide. Modern scarlets are mixed from a diketopyrrolopyrrole red (PR254) or a cadmium sulfoselenide red (PR108). |
| Transparency | Depends on the pigment behind it. Pyrrole reds run semi-transparent to semi-opaque; cadmium reds are fully opaque and sit on top of a wash rather than glowing through it. |
| Lightfastness | Excellent for both families used today. Pyrrole and cadmium reds are among the most lightfast reds available, which the original dyes never could claim. |
| Granulation | None for pyrrole reds, which dry smooth. Cadmium reds can granulate faintly, depending on the brand's fillers. |
| Staining | High for pyrrole reds, which bite into the paper. Cadmium reds sit more on the surface and lift more easily while still damp. |
| Toxicity | Pyrrole reds are non-toxic. Cadmium reds contain a heavy metal and should be handled like any cadmium pigment: no dry sanding, no pointing brushes with your lips, and wash your hands after use. |
These describe the pigment in general. Every brand's tube behaves a little differently, so test yours on scrap paper.
How to mix scarlet
Scarlet is one of the easier colors to reach honestly, because modern pigments were built to be exactly this: a clean, warm, orange-leaning red. Pyrrole red on its own gets you close, and cadmium red, warmed with a touch of orange, gets you the rest of the way. Push either one toward blue and you have wandered into vermilion territory, a different, older story.
The pairing that matters is with its cooler cousin. Scarlet next to crimson is the oldest contrast in the red family: one jumps forward, the other sits back, and a painting with both in it reads as having real depth in its reds instead of one flat note.
| Mix | Recipe | Best for |
|---|---|---|
| Scarlet from scratch | Pyrrole red with a touch of Sunset Orange | Poppies, brake lights, a matador's cape |
| Cadmium version | Cadmium red light, used nearly straight from the pan | Opaque, sunlit reds that need to cover what is under them |
| Push toward crimson | Scarlet with a whisper of ultramarine | When a red needs to cool down and recede |
| Old cochineal look | Scarlet very dilute over a warm ochre wash | Faded red cloth, old brick in full sun |
| Sunset red | Scarlet with Lemon Yellow, tipped toward the yellow | Fire, autumn leaves, a warm evening sky |
Closest mix from the Tobio's kit
Poppy Bloom on its own is already cool for a scarlet, so warm it with Sunset Orange, roughly two to one, until it jumps forward the way scarlet should. A speck of Lemon Yellow pushes it further toward fire engine if you need it. Keep it clean: any Twilight Indigo or Royal Plum added to warm scarlet drags it straight back toward crimson, a different color with a different job. Test on scrap first.
The 12-color kit does not include a tube of scarlet, so this is how I get there with what is in the palette. Running low on a color? The 12 paint refills drop straight into the wells.
Using scarlet in watercolor
Use scarlet wherever a red needs to come forward and announce itself: a poppy in full sun, a stop sign, the one bright object that should catch the eye first in a painting. It is not a color for shadows or restraint.
It is a strong color, so a little goes further than it looks like it should on the palette. Lay it thin first and build up, rather than starting at full strength and trying to talk it back down.
It pairs naturally with its own family. A scarlet next to a crimson gives a painting two reds that read as different temperatures instead of one flat red note, and a scarlet next to a green makes both look more intense than either does alone.
One thing I learned the hard way: scarlet has dressed cardinals, soldiers and warning signs, but it does not play well with every neighbor on a modern palette. Next to some pinks it turns them muddy instead of making them glow. Test a new pairing on scrap before you commit it to the good paper.
Everything I use on this page is the Tobio's Watercolor Kit: twelve colors chosen to mix, a walnut palette, cotton paper, and a water brush. Want to see how any two of the colors blend before you commit? Try the interactive color mixing chart.
Get the kitScarlet vs crimson (and vermilion)
Crimson is scarlet's cooler sibling, pulled toward blue instead of orange. Line the two up and scarlet jumps off the page while crimson sits back on it, which is the whole reason a red-heavy painting benefits from both rather than one red mixed lighter and darker.
Vermilion is the pigment that used to do scarlet's job before chemistry caught up. Ground from cinnabar, mercury sulfide, it gave artists from Botticelli to Renoir the orange-red they needed, and it is the direct ancestor of the cadmium and pyrrole reds sold as scarlet now. The difference today is mostly toxicity: vermilion's mercury against a pyrrole red's nothing at all.
If scarlet is a trumpet, crimson is a cello playing the same note an octave down, and vermilion is the older instrument they both replaced.
Questions people ask
What color is scarlet?
Is scarlet warm or cool?
What colors make scarlet?
Is scarlet toxic?
Scarlet vs crimson, what is the difference?
Why do cardinals wear scarlet, not purple?
Sources
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