Han purple and Han blue
Ancient synthetic pigments of blue and purple, first made in early China
No single value: Han purple and Han blue is a material, and its colour varies. The background shows its family, blue.
Han purple and Han blue are synthetic pigments made from barium copper silicate, developed in China from the Western Zhou period until the end of the Han dynasty. Han blue is a true blue, while Han purple appears as a dark blue or indigo, shifting to purple when ground or decomposed. These pigments were used in beads, painted figurines, and the Terracotta Army, and are known for their unique chemistry and historical
- First synthetic blue and purple pigments in China
- Used on the Terracotta Army's trousers
- Made from barium, copper, silica, and lead
- Han purple is less stable than Han blue
- Han blue occurs naturally as effenbergerite
What colour is Han purple and Han blue?
Han purple and Han blue are two closely related synthetic pigments first developed in ancient China. Both are made from barium copper silicate, but Han blue is a stable blue, while Han purple appears as a dark blue or indigo that can shift to a purplish shade when ground or decomposed. These colours set themselves apart from natural pigments by being among the earliest synthetic pigments in the world, and by their distinctive chemical structure.
Where does Han purple and Han blue come from?
The names Han purple and Han blue come from their use and development during the Han dynasty in China, though their origins go back to the Western Zhou period. There is debate over whether the technology was influenced by Egyptian blue, but the use of barium and lead, and the lack of Egyptian blue in China, suggest an independent Chinese invention. The pigments were likely developed through advances in glassmaking and high-temperature kiln techniques.
How is Han purple and Han blue made?
To make Han purple and Han blue, ancient craftspeople combined a barium mineral (such as witherite or baryte), quartz, a copper mineral (like malachite), and a lead salt. The mixture was fired at high temperatures (around 900–1000 °C) for many hours. Han blue forms with more silica and longer firing, while Han purple forms faster but is less stable. The process required careful temperature control, especially for Han purple, and often produced mixtures of both pigments.
Where Han purple and Han blue is used
These pigments were used in a range of objects, including beads from the Western Zhou period, octagonal sticks thought to be traded as pigment sources, painted pottery figurines, and most famously, the Terracotta Army of the Qin dynasty. Han purple was used on the warriors’ trousers, bound to the surface with lacquer. The pigments were also applied to ceramics and metal objects during the Han dynasty.
Blue around the world
What the blue family means from country to country.
Lapis lazuli has been mined in the mountains of Badakhshan for more than six thousand years. Ground to powder it gave ultramarine, the costliest blue in European painting.
Royalty and powerSacred and holyAweSource: Lapis lazuliThe chadari is a full-length covering for women with a mesh panel over the eyes. In Kabul and the north it is most often a light blue.
Protection and healingSource: BurqaThe blue band of the flag stands for the wish of the Armenian people to live under peaceful skies. The red above it is for the highlands and the struggle to survive.
Politics and protestHopeSource: Flag of ArmeniaThe flag is sky blue, white and sky blue, created by Manuel Belgrano in 1812. National teams are called the Albiceleste, the white and sky blue.
Politics and protestPrideSource: Flag of ArgentinaBoca Juniors play in blue and gold. The club's story is that in 1907 it took the colours of the flag of the next ship into port, which was Swedish.
Festival and celebrationPrideSource: Boca JuniorsTo be true blue is to be honestly and loyally Australian. The phrase is older than the country, but Australians have made it their own.
Politics and protestTrustSource: True Blue (John Williamson song)Shades and relatives of Han purple and Han blue
Han blue and Han purple can be mixed to produce a range of blue-purple shades. Han purple becomes more purplish when ground, while Han blue becomes more bluish. The two are sometimes confused with natural pigments like azurite, but are chemically distinct. Han blue is more stable, while Han purple is sensitive to heat and acid.
Questions people ask about Han purple and Han blue
What colour are Han purple and Han blue?
Han blue is a true blue pigment, while Han purple is a dark blue or indigo that can appear purple, especially when ground or decomposed.
Where does the name come from?
The names come from their use and development during the Han dynasty in China, though the pigments were first made earlier, in the Western Zhou period.
How were Han purple and Han blue made?
They were made by heating a mixture of barium mineral, quartz, copper mineral, and lead salt at high temperatures, with the exact colour depending on the ingredients and firing conditions.
What were Han purple and Han blue used for?
They were used as pigments in beads, painted pottery figurines, ceramics, and the Terracotta Army, mainly in ancient China.
Are Han purple and Han blue natural or synthetic?
Both are synthetic pigments, created by ancient Chinese craftspeople using high-temperature processes.
Good reading and sources
The facts on this page come from the Wikipedia article "Han purple and Han blue", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Rang 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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