Martius yellow
A synthetic yellow dye once used for wool and in laboratory staining
No single value: Martius yellow is a material, and its colour varies. The background shows its family, yellow.
Martius yellow is a man-made yellow dye first described in the 1860s. Created by adding nitro groups to 1-naphthol, it was briefly used to colour wool but faded quickly in light. Today, it finds a role in laboratory stains, especially to highlight red blood cells in tissue samples.
- First described in the 1860s
- Made by nitrating 1-naphthol
- Used to dye wool but fades in sunlight
- Now used to stain red blood cells in lab samples
What colour is Martius yellow?
Martius yellow is a synthetic dye that produces a yellow colour. It is made by chemically modifying 1-naphthol, a type of organic compound. The dye stands out for its use in scientific staining, where it helps distinguish red blood cells from other tissue parts under the microscope. Its yellow shade is clear and bright, though it does not hold up well to light.
Where does Martius yellow come from?
The dye was first described in the 1860s, during a period of rapid growth in synthetic dye chemistry. Its name comes from its discoverer, but the sources do not specify who that was. Martius yellow belongs to a group of chemicals known as dinitro-naphthols, which are created by adding nitro groups to naphthol.
How is Martius yellow made?
Martius yellow is produced by treating 1-naphthol with nitrating agents, which add nitro groups to the molecule. This chemical reaction creates the yellow dye. The process is entirely synthetic and does not rely on natural sources.
Where Martius yellow is used
The dye was once used to colour wool, but its popularity faded because it did not resist fading in sunlight. Today, Martius yellow is mainly used in laboratory settings. It is a component of certain staining techniques, where it colours red blood cells yellow to make them stand out against other tissue structures when viewed under a microscope.
Yellow around the world
What the yellow family means from country to country.
The yellow disc of the Aboriginal flag is the sun, giver of life. The flag was designed by the Luritja artist Harold Thomas and first flown in Adelaide in 1971.
Sacred and holySource: Australian Aboriginal flagAt the gaye holud, held a day or two before a wedding, relatives rub turmeric paste on the bride and groom. Guests dress in yellow and orange.
Weddings and marriageFestival and celebrationJoySource: Gaye holudOn Pohela Falgun, the first day of spring, young women wear yellow and orange saris, a shade called basanti, with flowers in their hair.
Festival and celebrationNature and renewalJoySource: Pohela FalgunThe Flemish flag is a black lion on yellow, and the Walloon flag a red cockerel on yellow. The language communities are often shown by these colours.
Politics and protestPrideSource: Flag of FlandersThe flag is yellow, the colour of the Sultan. By custom, ordinary people did not wear yellow in the ruler's presence.
Royalty and powerPrideSource: Flag of BruneiThe national football team plays in a yellow shirt with green trim, the canarinho. It was chosen in a newspaper contest after the 1950 World Cup final was lost in white.
Festival and celebrationPrideJoySource: Brazil national football teamShades and relatives of Martius yellow
Martius yellow is part of a group of related dyes called dinitro-naphthols, which have similar chemical structures but may differ in how their atoms are arranged. It can be mixed with other yellow dyes to make the colour more intense in staining procedures.
Questions people ask about Martius yellow
What colour is Martius yellow?
Martius yellow is a synthetic dye that produces a clear, bright yellow colour.
Where does the name Martius yellow come from?
The name refers to its discoverer, though the sources do not specify who that was.
How is Martius yellow made?
It is made by adding nitro groups to 1-naphthol through a chemical process called nitration.
What is Martius yellow used for?
It was once used to dye wool, but now is mainly used in laboratory stains to highlight red blood cells.
Why did Martius yellow fall out of use as a textile dye?
It was not light-fast, meaning it faded quickly when exposed to sunlight.
Good reading and sources
The facts on this page come from the Wikipedia article "Martius yellow", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryRang rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes. The swatch is an approximation: named colours are not fixed standards, and every screen shows them a little differently. If something is wrong, tell us. Last refreshed 2026-10-03.
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