What is wenge?
The Wood Guide · Wood register
Wood speciesWenge
Deep milk-chocolate brown with a violet sheen and fine veins. Of all the dark wood species, wenge is the most recognisable — and the most sought after in interiors.
- Millettia laurentii
- ± 850 kg/m³
- Very dimensionally stable
Wenge
Deep milk-chocolate brown with a violet sheen and fine veins. Of all the dark wood species, wenge is the most recognisable — and the most sought after in interiors.
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What makes wenge special
A rare combination: distinctly dark in colour, and at the same time exceptionally dimensionally stable.
Wenge is the trade name for Millettia laurentii, a broadleaf tree from Central and West Africa. Congo, Gabon and Congo-Brazzaville are the main areas of origin, and the best material comes from West Congo, where the tree grows in swamp forests. You can see the difference in the colour: wood from less favourable growing areas is darker and less stable.
The colour is what it is all about. Milk-chocolate brown with a violet sheen, run through with alternating dark and lighter veins that give a flame figure on the tangential face. No other commercial species comes close without being stained.
Less obvious but just as important: wenge moves remarkably little. With a radial shrinkage of less than one per cent and a tangential shrinkage of one and a half, it stays flat where other species are already starting to cup. That makes it suitable for parquet and for wide furniture tops.
When cut into, a wenge tree exudes red, sticky extractives. Those substances are also the reason for the wood's natural durability — and for the fact that wenge sometimes takes glue and finishes less readily than other species.
- Botanical name
- Millettia laurentii De Wild
- Origin
- Congo, Gabon, Congo-Brazzaville
- Tree height
- up to 30 m; branch-free up to ± 10 m
- Lifespan of the tree
- 150 to 200 years
- Density
- about 850 kg/m³
- Radial shrinkage
- 0.7 to 0.8 per cent
- Tangential shrinkage
- 1.4 to 1.5 per cent
- Colour
- milk-chocolate brown with a violet sheen
To be fair: wenge is difficult to work and even more difficult to finish. It is hard and blunts tools, it splinters sharply — wenge splinters are known for being particularly painful and can become infected — and the extractives can interfere with the adhesion of glue and lacquer. Expect to need sharp tools, pre-drilling, and test pieces before you apply the finish to the real work.
Colour, figure and texture
Colour
Milk-chocolate brown with a violet sheen in the best quality. Material from less favourable growing areas tends towards almost black and is less stable.
Figure
Dark and light fine stripes that alternate. On the tangential face — where the board is sawn across the growth rings — that produces a pronounced flame figure.
Structure
Fine and striped. That gives the wood the luxurious, crisp look for which it is sought after in interiors.
Ageing
Wenge darkens under the influence of light and loses some of its violet sheen in the process. Indoors this happens slowly and evenly.
Where wenge belongs
| Use | Why wenge | Point to watch |
|---|---|---|
| Parquet | hard, dimensionally stable and distinctive in colour | expensive; and scratches show up on the dark surface |
| Furniture tops | stays flat, even in wide sections | pre-drill; the wood splits easily |
| Veneer | this is where the figure shows to best effect | the most common way you come across wenge |
| Stairs and handrails | hard-wearing and sturdy | heavy; the structure has to be designed for it |
| Inlay work | maximum contrast against light species | the classic partner of maple and ash |
| Musical instruments | dense and stable | mainly keys, necks and detail work |
| Outdoors | not recommended | durable enough, but too expensive, and it turns grey |
Working with wenge
Sharp tools
Wenge is hard and blunts tools quickly. Work with sharp chisels and carbide saw blades, and expect to sharpen more often.
Always pre-drill
The wood splits easily along the grain. Pre-drilling for every screw and every dowel is the rule, not the exception.
Take splinters seriously
Wenge splinters are sharp and the extractives can cause an infection. Wear gloves when handling rough material and remove splinters straight away.
Extract the dust
Fine wenge dust irritates the airways and skin. Work with dust extraction and a mask, especially when sanding.
Test your finish
The extractives can interfere with glue and lacquer. Make a test piece before you apply the finish to the real workpiece.
Fill or leave open
You can fill the open pores for a mirror-smooth surface, or leave them open for a matt, tactile texture. Both are common — it is a choice.
Wenge is on the red list of threatened species. Ask your supplier for documents of origin; since the European rules on deforestation-free products, that information has to be available anyway. If you want the colour without the question of origin: smoked oak or dark-stained ash come close.
Frequently asked questions about wenge
Where does wenge come from?
From Central and West Africa, mainly Congo, Gabon and Congo-Brazzaville. The best material comes from the swamp forests of West Congo.
How heavy is wenge?
About 850 kilos per cubic metre — considerably heavier than oak and among the heavier commercial species.
Does wenge move much?
Remarkably little. With a radial shrinkage under one per cent and a tangential shrinkage of one and a half, it stays flat where other species are already cupping.
Why are wenge splinters so nasty?
They are sharp, and the wood's natural extractives can cause an infection. Wear gloves when handling rough material and remove splinters straight away.
Can wenge be used outdoors?
Technically it is durable enough, but in practice it is not done: it is too expensive for outdoor work and it turns grey, so you lose exactly what you paid for.
What is an alternative to wenge?
For the colour: smoked oak or dark-stained ash. They come close without the question of origin that comes with a threatened tropical species.
More in the wood register
Each species has its own page, with the same figures and the same honest drawback.
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Photos via Wikimedia Commons: Millettia laurentii — Philipp Zinger, CC BY-SA 4.0 · Millettia laurentii — Lupus in Saxonia, CC BY-SA 4.0