Woods to Know: Kingwood - Canadian Woodworking Magazine

Woods to Know: Kingwood

Kingwood (Dalbergia cearensis)

Shortly after the discovery of the New World, Europeans began harvesting the pristine forests of North and South America. From Brazil came a very beautiful member of the rosewood family. Originally it was called Prince's wood but later it was named Kingwood. By the end of the 17th century, it was the most expensive wood used in European furniture. It was a personal favourite of the French Kings Louis the 14th and 15th (hence its name). Their entire furniture collection had extensive Kingwood inlays.
 
Kingwood is a small tree rarely exceeding 55 feet with a 10 inch bole. Historically there may have been larger specimens, but they were the exceptions to the rule. Consequently, Kingwood is rarely seen as lumber. Most woodworkers will encounter smaller blocks, short pieces, and veneer.

WTK_kingwood
 
The heartwood is purple to reddish brown often with attractive black streaks giving it a distinctive and beautiful appearance. The sapwood is sharply demarcated from the heart and is a pale yellow colour. Kingwood is a very hard and dense wood. It is usually straight-grained  but occasionally can present as interlocked. It has a fine even texture with a bright natural lustre.
 
Like all rosewoods, Kingwood contains natural oils and resins that yield a pleasant rose-like scent when freshly cut. These oils help protect the tree from various insect and fungal pests. In addition, the oils and resins make Kingwood a very durable wood, even resistant to termites. 
 
Kingwood can be hard to dry without checking due to its high density. It is often sold air-dried with waxed end grain, but this material will need further acclimation to get the moisture content down to a workable level. 

WTK_kingwood-endgrain
Kingwood end-grain
 
Since larger pieces of Kingwood are rare, woodworkers who want to use Kingwood for casework will have to use veneer. Kingwood veneer is available since slicing the logs into veneer is a more economical use of this rare wood. It is often sliced using the half round method. This variation of rotary slicing yields larger veneer sheets than traditional methods without the presence of wild grain.
 
It is an excellent turning wood, capable of holding detail and can be polished to a high lustre. Tools must  be sharp to deal with this hard, dense wood. Screws must be predrilled. Irregular grain might need different feed rates when machining.  It can be difficult to glue due to its high density and oil content. Too high a clamp pressure can starve glue joints. Joinery surfaces should be glued soon after final milling. There is a lot of debate about wiping surfaces to be glued with acetone to remove the oils. It may be wise to experiment with smaller scrap pieces before using this procedure.
 
The oils can also affect finishing especially when using polyurethane and other oil-based finishes. De-waxed shellac can be used as a barrier to prevent Kingwood's oils from interfering with various finishing techniques. Remember, Kingwood is too beautiful to be stained!
 
Kingwood  is reputed to have a excellent tonal qualities. It can be seen in various woodwind instruments. Its small size makes it difficult to provide pieces big enough for guitar backs and sides. When the rare guitar set is available, luthiers report it has a tone comparable to Brazilian Rosewood.
 
All woodworkers should use dust protection when first starting to work with any rosewood. While reports of allergic reactions with Kingwood are rare, it is always advisable to see how you react to the wood to prevent a trip to the doctor.
 
While rare and expensive, Kingwood is not endangered. Perhaps its small size has saved it from the over exploitation seen with other members of the rosewood family.  Kingwood is perfect for accent pieces and decorative objects. Once you use this wood for a distinctive door pull, inlay, or tool handle, there may be no turning back from Kingwood.
 
 
Average Dried Weight75 lbs/ft³A measure of its weight at 12% moisture and an ambient temperature of 70°F.
Specific Gravity1.20A measure of the ratio of its density compared to water (at 12% MC)
ShrinkageRadial: n.a.
Tangential: n.a.
Volumetric: n.a.
Radial (the amount of crosswise shrinkage);
Tangential (the amount of lengthwise shrinkage);
Volumetric (the total amount of shrinkage.)
T/R Ration.a.A measure of the uniformity of tangential to radial shrinkage.
Janka Hardness3,340 lbfA measure of resistance to denting and abrasion.
Crushing Strength lbf/in²A measure of compression strength parallel to the grain.
Colour
Heart is a beautiful purple to reddish brown with dark black streaks. Sapwood is a pale yellow.
GrainUsually straight grained, can be interlocked. 
Texture
Fine uniform texture. Very lustrous appearance.
Workability
Can be difficult due to high density. Sharp tools required. Natural oils can impede gluing and finishing. Turns extremely well. 
UsesInlay, veneer, turnings and decorative objects.
Price$89.00/bf 4/4
 
  
Photos and Specifications Courtesy of: The Wood Database