Some samples were sanded to 1500-grit and then their chatoyance was measured after exposure to UV light through the use of a tanning lamp. The results are summarized in chart below showing that:
Maple: brightness decreases with exposure time, and visible chatoyance (PZC) increases.
Okoume: brightness decreased, but then reaches some sort of stabilization, while chatoyance keeps increasing.
Oak and Cherry: brightness decreased, while chatoyance reached a peak and then started decreasing.
Black Walnut: this appears quite stable in terms of brightness, but its color visibly changes.
Sapele shows no significant effect on brightness, and again chatoyance reached a peak and then started decreasing.
Genuine Mahogany appears similar to Sapele, but it shows some brightness reduction.
Brightness on the right vertical axis is shown as a fraction of white photographic paper brightness.
GIFs below show hot the samples appeared at various stages: