Hello Alan,
I wasn't referring to the usually chatoyant effects you've shown examples of but rather to strongly contrasting woods as in the attached pic (courtesy of rsword). Will post some more links later when I have more time. The latter wood types seem to be actively selected for in N Malaya and are supposed to be the result of more pronounced dry seasons (possibly coupled with harsh growing conditions like on windy cliffs).
Regards,
Kai
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