Raw, Mature, Dropped and Worm: Four Resin-Formation Types

Raw (sheng): formed on a living tree after wounding; usually clearer aroma.
Mature (shu): from a dead/rotted tree, oils remain and age—often deeper.
Dropped (tuo): branch dropped, resin formed then separated.
Worm (chong): insect borings induce resin along tunnels, fanciful shapes.

Four types

Names hint at cause and scent, but market usage is loose—judge by aroma, oil and source.

Compiled for general knowledge; traditional references are cultural notes, not medical advice.

Agarwood is traditionally classed by how it formed—live-tree, dead-tree, dropped or worm-induced resin.

选购沉香应认准可溯源、可检测的渠道，按用途选择形态（线香 / 手串 / 原料），不盲目追高、不轻信「野生」「沉水」等夸大宣传。

沉香怕潮、怕串味、怕暴晒，应密封、避光、阴凉存放，不同产区分开保存；长期不用的香材定期通风检查，防霉防虫。

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