What "sinking" really measures, and why it is a tier — not a verdict.
Updated 2026-10-07 · Wubaiyi Agarwood (伍佰艺沉香), Hainan plantations & Beijing flagship store
Sinking is a simple, checkable proxy for density, and density tracks resin content. Drop a chip in water: if it goes down, the resin saturation is high. That is all the word claims — and it is genuinely useful precisely because you can test it yourself.
The dark lines and patches in agarwood are resin. Where the grain is rich and even, density rises; where it is pale and sparse, the piece is lighter. So oil-line pattern and the sinking test describe the same underlying thing from two directions. Photograph the oil lines and weigh the piece — together they tell the story.
A sinking-grade bead is not automatically the right purchase. Heavier material is better suited to collecting and display; for everyday wearing or repeated heating, semi-sinking or non-sinking grades often give more fragrance minutes per unit of budget. Grade is one axis of value; use is the other.
That short list removes most of the ambiguity — and most of the room for a faked label.
Sinking means higher density and resin content, which is one measure of quality. For daily wear or frequent heating, lighter grades often give better value.
Drop a small chip in water. Sinking pieces are dense enough to go down; test a chip rather than a finished bracelet.
Oil lines are the visible resin. Richer, even, grain-following lines indicate higher resin content and therefore higher density — the same property the sinking test measures.