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): 6.5
Min PZC read (of all measurements): 5.8
Max PZC average on one log: 6.0
Min PZC average on one log: 6.0
PZC Average of all logs: 6.0

Species: swartzia panacoco
Family: Fabaceae
Clade: Angiospermae
Description: A medium to large Amazonian tree known for its extremely dense, dark, and durable wood. It features alternate, unifoliolate leaves and produces yellow flowers followed by woody pods.
Other Local Names: Wamara, Carrapatinho, Coraçao de negro, Gombeira, Mocacahiba, Agui, Banya, Wamara, Bois perdrix, Ferreol, Ironwood, Wamara, Gandoe, Ijzerhart, Zwart parelhout

Reference Colour: Dark brown
Texture: Medium
Grain: Straight or interlocked
Interlocked Grain: Slight
Notes: Logs have a small diameter with a wide light yellow sapwood. Heartwood deep dark brown with lighter thin streaks.

Diameter: 40÷60cm
Density @12% MC: 1200kg/m³
Janka Hardness: 5520lbf
Crushing Strength @12%MC: 110MPa
Static Bending Strength @12%MC: 202MPa
Longitudinal Modulus of Elasticity E: 32.7GPa
Volumetric Shrinkage Coefficient: 0.82% per %
Total Tangential Shrinkage TS: 8.3%
Total Radial Shrinkage TS: 6.3%
T/R Anisotropy Ratio: 1.3-
Fibre Saturation Point: 23%
Thermal Conductivity: 0.38W/mk
Lower Heating Value: 19220KJ/Kg
Sapwood Thickness: 3÷8cm
Sapwood Demarcation: Clearly demarcated

Resistance to Decay: Class 1 – very durable CORAÇAO DE NEGRO* / PANACOCO Cross sections of Swartzia leiocalycina
Resistance to Dry Wood Borers: Class D – durable (sapwood demarcated, risk limited to sapwood)
Resistance to Termites: Class D – durable
Treatability: Class 4 – non-treatable
Use Class Covered by Natural Durability: Class 4 – in ground or fresh water contact
Durability Notes: 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: Slight 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
Sawing Machining Notes: Difficult to saw due to hardness.
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: Uses similar to those of Ebony, but end uses are limited by the small size of logs
End Uses: Arched goods, Panelling, Turned goods, Built-in furniture or mobile item, Cabinetry (high-end furniture), Flooring, Musical instruments, Sliced veneer, Stringed instruments (bows), Sculpture, Wind instruments, Marquetry

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