Chatoyance was measured by the chatometry.com team using the PZC method. The statistics for this specific timber are hereby summarized to provide an evaluation of data robustness:
Number of sources for samples: 1
Number of individual trees analyzed: 1
Number of specimens: 2
Number of measurements: 6
Max PZC read (of all measurements): 7.8
Min PZC read (of all measurements): 5.4
Max PZC average on one log: 6.3
Min PZC average on one log: 6.3
PZC Average of all logs: 6.3

Species: coula edulis
Family: Olacaceae
Clade: Angiospermae
Description: Coula edulis is a large evergreen tree native to tropical West and Central Africa, primarily valued for its edible, oily nuts, often called African walnuts.
Other Local Names: Éwomè, Ewome, Ngouma, Kumunu, Attia, Éhoumé, Noisetier d’Afrique, Ivianlegbe

Reference Colour: Red brown
Texture: Fine
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Wood purplish brown, with dark brown veins. Sometimes wavy grain.

Diameter: 60÷80cm
Density @12% MC: 1010kg/m³
Janka Hardness: 2250lbf
Crushing Strength @12%MC: 78MPa
Static Bending Strength @12%MC: 142MPa
Longitudinal Modulus of Elasticity E: 19.49GPa
Volumetric Shrinkage Coefficient: 0.63% per %
Total Tangential Shrinkage TS: 8.5%
Total Radial Shrinkage TS: 4.5%
T/R Anisotropy Ratio: 1.9-
Fibre Saturation Point: 23%
Thermal Conductivity: 0.32W/mk
Lower Heating Value: 19720KJ/Kg
Sapwood Thickness: 3÷4cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 1 – very durable
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood)
Resistance to Termites: Class D – durable
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 4 – in ground or fresh water contact Atlas of Tropical Timber Species COULA
Durability Notes: This species is listed in the NF EN 350 standard. According to the European standard NF EN 335 of May 2013, performance length might be modified by conditions in which it is used.

Log Buoyancy: Does not float
Log Conservation: Good
Drying Rate: Slow
Drying Risk of Distortion: High risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: High risk

Blunting Effect: Fairly high
Sawing Tooth: Stellite-tipped
Machining Tool: Tungsten carbide
Suitability for Peeling: Not recommended or without interest
Suitability for Slicing: Good
Assembly Nailing Screwing: Good but pre-boring necessary
Assembly Notes: Very high specific gravity: important that gluing be performed in compliance with the code of practice and instructions for the glue used.
Additional Notes: Resistant to one or several acids. Mainly appreciated for its fruits
End Uses: Heavy carpentry, Sliced veneer, Vehicle or container flooring, Decking, Industrial or heavy flooring, Poles, Stakes, Sleepers

Source 1: Tropical Timber Atlas, Editions Quae, e-ISBN 978-2-7592-2770-9