Genetic (DNA) Testing: How Does It Identify the Species of the Oud Tree?

We close the specialized inspections with a tool that answers a question no other answers: genetic (DNA) testing. All the previous tests ask "is this a real resin or an added one?", but the DNA asks a different question: from which species of tree did this wood come? In this article we show how it works, which question it settles alone, and why it remains the rarest of the tools and the farthest from the ordinary buyer.

What question does it settle alone?

Oud comes from the trees of the genus Aquilaria and its relatives, and it has several species: sinensis, crassna, malaccensis, and others. The genetic test reads a sequence of DNA in the wood sample and compares it with known references, so it tells you with a scientific certainty: this tree is of this species. This is a question that neither the nose nor the microscope nor even the chemical analysis answers with the same precision.

Its practical benefit appears when a wood from a lookalike tree that is not real oud is sold, or when a rare species is claimed while it is another species. The DNA settles the identity of the tree with a decisive settlement that admits no argument.

What does it not answer despite its power?

It is important not to overstate our expectations; the DNA answers the question of species only:

• It does not measure the quality of the resin: a fine species may give a wood poor in resin, and an ordinary species may give a rich piece. The species is not the quality.
• It does not reveal the additives: a dyeing, a scenting, or a soaking does not show in the DNA; that is the task of the chemical analysis and the visual inspection.
• It does not determine the region within the species: it tells you "the species is such," but it does not settle exactly which island or forest the tree came from.
• It needs a reliable reference: the result depends on an accurate reference database; a deficiency in it limits the certainty.

Where is it actually used? And the takeaway

Because it is the rarest of the tools, the most expensive, and the most specialized, the genetic test remains far from everyday buying and appears in specific contexts:

• Scientific research: studying the species of Aquilaria, their distribution and their conservation.
• Protection and law: the species of oud are listed in the CITES convention for the protection of endangered species; the test documents the species in regulated trade and disputes.
• Large commercial documentation: huge deals or rare collections that deserve a proof of species.

For the ordinary buyer, there is no need for this test; the bundle of the senses, the cross-section, and the microscope with a transparent seller is enough. With this we close all the detection inspections — from the senses to the lab. And in the following articles we move from "how do you inspect" to "how do you buy safely"; we begin with the questions you ask the seller before buying.