Incense burns so steadily that people once used it as a clock
A good incense stick smoulders at a slow, even pace from end to end, so evenly that burning trails of incense powder served as clocks. The chemistry behind that glow is close kin to gunpowder minus the sulphur, and the habit of burning fragrant stuff stretches back more than five thousand years.
The oldest known incense burner comes from Qustul in Lower Nubia, in present-day Sudan, made around 3300 to 3000 BCE, before Egypt's first dynasties. Its processional decoration hints that burning aromatics already carried ritual and political weight. Egyptians used incense to cover bad smells, ward off evil spirits and honour the gods, and temple reliefs at Deir el-Bahari show expeditions sent to fetch aromatic resins. Babylonians burned it while consulting oracles, and the custom travelled on to Greece and Rome. In India the Vedas mention it for both scent and medicine, and in China it featured in ceremonies by around 2000 BCE.
Korean Buddhist monks carried the practice to Japan in the sixth century, where appreciating fine fragrance grew into a refined court art. Later it spread to warriors: samurai reportedly scented their helmets and armour before battle so that, if they fell, they would leave a dignified impression. Trade in aromatic materials was so valuable that one ancient caravan route took the name Incense Route.
There are two basic kinds. Resins such as frankincense and myrrh, famous in the West from the Bible, cannot burn alone and need charcoal or embers underneath. Sticks, cones and coils carry their own fuel. One common recipe pairs charcoal or wood powder with an oxidiser such as saltpetre; another binds the fragrance with plant gums or bark powders whose cellulose forms a stable ember. Either way the mix smoulders at roughly 220 to 260 degrees Celsius, and too much oil will smother it.
Shapes vary by region. Coils in Chinese temples can burn for hours or even days, cones were invented in Japan in the 1800s, and Tibet and Nepal twist incense into portable ropes that stay fresh for years. The name joss stick traces back through pidgin English, Javanese and Portuguese to the Latin word for god.
Source: Incense
