Live Resin, Dead Resin, Insect Bore, Ant Nest: A Complete Guide to Four Agarwood Formation Types

Agarwood formation is mainly classified into four types: live resin (shengjie), dead resin (shujie), insect bore (chonglou), and ant nest (yichen). Live resin forms when a living tree secretes resin to heal wounds; dead resin develops after the tree dies or falls, allowing prolonged aging; insect bore is triggered by wood-boring insects; ant nest results from ant activities. Understanding these types is fundamental to judging agarwood quality and value.

Live Resin (Shengjie): Resin Secretion from Wounds on Living Trees

Live resin agarwood forms when a living agarwood tree is wounded by axes, wind breakage, or lightning. The tree secretes resin to seal the wound, which gradually condenses into agarwood over years. Live resin typically shows clear oil lines and a fresh, uplifting aroma, but the aging degree varies due to relatively shorter formation time. In the Agarwood Encyclopedia, live resin is considered the most basic formation type and the most common in the market.

Dead Resin (Shujie): Natural Aging of Fallen or Dead Wood

Dead resin, also called dead knot, forms after an agarwood tree dies naturally or falls. The resin continues to age within the wood for decades or even centuries. Due to long-term weathering and microbial action, the wood fibers gradually decay, leaving dense resinous parts. Dead resin agarwood has a mellow, deep aroma with lasting sweetness. In the Identification Pillar Page, dead resin is often used as a reference standard for high-quality agarwood, as its oil content and aroma layers often surpass live resin.

Insect Bore (Chonglou): Formation Induced by Wood-Boring Insects

Insect bore agarwood forms when agarwood trees are attacked by longhorn beetles, termites, or other borers. The tree secretes resin to repair the tunnels, and the resin mixes with insect secretions to condense into agarwood. Insect bore agarwood often has peculiar shapes, such as spiral or hollow patterns, with a unique sour or honey-like note. In Chinese Incense Studies · Agarwood Identification, insect bore is regarded as a representative of natural creation, as its formation entirely depends on insect activity and is hard to replicate artificially.

Ant Nest (Yichen): Agarwood Formed by Ant Colony Activities

Ant nest agarwood forms when ants build nests on agarwood trees. The ants chew the wood and secrete formic acid over time, stimulating resin formation. Ant nest agarwood usually carries a distinct formic acid scent, with a rich and slightly pungent aroma, and oil lines often distribute along ant trails. Similar to insect bore, ant nest is biologically induced, but the colony activity makes the formation range wider and shapes more complex. In the Kyara Pillar Page, top-grade kyara occasionally shows ant nest features, but ant nest does not equal kyara; a comprehensive judgment based on oil, aroma, and texture is required.

Comparison and Identification Key Points of the Four Types

Live resin, dead resin, insect bore, and ant nest each have distinct features: live resin has clear oil lines and a fresh aroma; dead resin has dense oil and a mellow aroma; insect bore has peculiar shapes with a sour note; ant nest carries a formic acid scent with oil lines along ant trails. Identification requires observing shape, smelling aroma, examining oil lines, and considering the formation background. Mastering these four types helps understand the causes and value differences of agarwood.

Conclusion: Live resin, dead resin, insect bore, and ant nest are the four basic types of agarwood formation. Live and dead resins focus on tree physiological reactions, while insect bore and ant nest depend on biological activities. Whether for collection or appreciation, understanding formation types is a fundamental lesson.

(This is industry observation and popular-science summary, not investment advice. Buy agarwood through legal channels with traceable, testable sources.)