Microscopic Examination: What Does the Microscope See That the Eye Does Not?

We have finished the home tests, and we now move to the specialized inspections. The first of them is the microscopic examination: magnifying the surface of the piece or its cross-section to see what the naked eye cannot. Why? Because magnification reveals the cellular structure of the wood, distinguishes a real resin deposit from a surface coating, and shows dye particles or foreign materials lodged in the fiber. In this article we show what the microscope adds, its limits, and when it is worth resorting to.

What does magnification add over the eye?

The naked eye sees the color and the general structure, but much of the evidence of fraud is too small to be seen. The microscope — even a simple magnifying loupe or a cheap digital microscope — takes you to the level of the fiber and the pores:

• The cellular structure of the wood: oud is a real wood with regular fibers and channels; manufactured materials or compressed woods show a different structure under magnification.
• A penetrating resin, not a surface coating: natural resin fills inside the cells and the channels; a coating or a dye sits over the surface as a layer whose borders show clearly under magnification.
• Dye particles and foreign materials: particles of an unnatural dye, or metallic specks, or a stickiness lodged in the grooves, appear clearly in a way the eye does not grasp.

What does it reveal, and what does it not?

It is important to set expectations; the microscope is a powerful tool but limited in scope:

• It reveals: surface intervention and structure. Dyeing, coating, a fine filling, a wood of different structure — all show under magnification.
• It does not reveal: the species and the origin. The microscope does not tell you whether it is a rare or common type, nor which country it came from; these are questions that need chemical or genetic analysis as we will see later.
• It does not measure the aromatic quality. The beauty of the scent remains for the heat and the nose; the microscope sees the structure, it does not smell the resin.
• It needs an expert interpretation. Seeing the details is one thing, and understanding their significance is another; the beginner may see and not distinguish.

When do you resort to it, and the takeaway

The microscopic examination is a middle step between the naked eye and the lab: cheaper and faster than chemical analysis, and more precise than sight alone. Resort to it when you want to confirm a doubt of a dyeing, a coating, or a fine filling, especially in precious or wholesale purchases. Make it a link in the chain: after the senses and the cross-section, and before the laboratory analysis if needed. And in the following article we move to the deepest of inspections: the chemical analysis and what it reveals about the components of the oud.