Sapwood vs Heartwood

Is chatoyance the same in Sapwood and in Heartwood?

Some examples below show how this can be quite variable; each gif is followed by a detail PZC map which allows to compare visible chatoyance between Sap and Heart.

Granadillo – from Seralvo
Chatoyance is more visible on heartwood.
Oak, Sessile – from Linea Legno
Chatoyance is slightly more visible on heartwood.
Ziricote – from Seralvo
Chatoyance very low, and slightly more visible on sapwood.
Katalox
Chatoyance is more visible on sapwood.
Purpleheart – from Seralvo
Chatoyance is visible on both heartwood and sapwood.
Cherry, Sweet – from Seralvo
Chatoyance is visible on both heartwood and sapwood.
Walnut, European – from Seralvo
Chatoyance is definitely more visible on heartwood.
Yew – from P. Hinds
Chatoyance is very low, and slightly more visible on heartwood.
Walnut, African – from Evolution Panels and Doors
Chatoyance is visible on both heartwood and sapwood.
Cocobolo
Chatoyance is very low, and slightly more visible on heartwood.
Hickory
Chatoyance is more visible on heartwood.
Rosewood, Madagascar – from A. Moro
Chatoyance is more visible on heartwood.

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