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: 16
Number of individual trees analyzed: 23
Number of specimens: 54
Number of measurements: 162
Max PZC read (of all measurements): 25.8
Min PZC read (of all measurements): 10.6
Max PZC average on one log: 23.6
Min PZC average on one log: 12.9
PZC Average of all logs: 17.0

Species: juglans regia
Family: Juglandaceae
Clade: Angiospermae
Description: A large, deciduous tree known for its pinnately compound leaves and edible nuts, encased in a green husk, which mature in autumn.
Other Local Names: Nussbaum, Walnuss, Nogal, Noyer, Noce commune, European walnut

Reference Colour: Brown
Texture: Medium
Grain: Straight
Interlocked Grain: Absent
Notes: Sometimes brown more or less yellow or pinkish brown, sometimes greyish, often with darker veins.

Diameter: 30÷80cm
Density @12% MC: 660kg/m³
Janka Hardness: 960lbf
Crushing Strength @12%MC: 64MPa
Static Bending Strength @12%MC: 117MPa
Longitudinal Modulus of Elasticity E: 11.8GPa
Volumetric Shrinkage Coefficient: 0.37% per %
Total Tangential Shrinkage TS: 7.5%
Total Radial Shrinkage TS: 5.5%
T/R Anisotropy Ratio: 1.4-
Fibre Saturation Point: 27%
Thermal Conductivity: 0.22W/mk
Sapwood Thickness: 2÷5cm
Sapwood Demarcation: Not clearly demarcated

Resistance to Decay: Class 3 – moderately durable
Resistance to Dry Wood Borers: Class D – durable (heartwood durable but sapwood not clearly demarcated)
Resistance to Termites: Class S – susceptible
Treatability: Class 3 – poorly treatable
Use Class Covered by Natural Durability: Class 2 – inside or under cover (dampness possible) Notes. This species is listed in the NF EN 350 standard. Atlas of Tropical Timber Species WALNUT
Durability Notes: This species is listed in the NF EN 350 standard. Atlas of Tropical Timber Species WALNUT Cross sections of Juglans regia

Log Buoyancy: Not applicable
Log Conservation: Low (treatment necessary)
Drying Rate: Normal to slow
Drying Risk of Distortion: Slight risk
Drying Risk of Case Hardening: No known specific risk
Drying Risk of Checking: Slight risk

Blunting Effect: Normal
Machining Tool: Ordinary
Suitability for Peeling: Good
Suitability for Slicing: Good
Assembly Nailing Screwing: Good
Additional Notes: Walnut is characterised by a, good dimensional stability and a great, transverse cohesion. It is very sought, after for the fabrication of top, range, hunting rifle butts. It has a good aptitude, for bending
End Uses: Turned goods, Cabinetry (high-end furniture), Interior joinery, Sliced veneer, Sculpture, Marquetry

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