A 10 by 10 cm material of White Birch wood (quater cut: USA and Canada). Captured with Photometric Stereo technique the way I described in one of my recent videos already (based on 16 images):
https://youtu.be/7YGd3bcO_Ys
I used AD200 Pro flash with TTL setting as a source of light since I proceeded with the capture in a daylight
I used ArtEngine for photometric stereo reconstruciton and tiling, and Substance Designer for some additional tweaking and color correction. Color was tweaked to match color spectrometer measured values. For those interested I shared more info in this video:
https://youtu.be/TcTh-1X2FsQ
These certain values with 49 other verneers color measurements were added to the paid version of this list:
https://gbaran.gumroad.com/l/rjthlk
At some point when the list is large enough and I manage to cover metals finaly, I plan to share them in form of a new color reference video :) so big thanks to those who purchased it as it helps me to co-fund my current research a lot
Cheers!
G.

Photometric Stereo setup used for this capture. More info: https://youtu.be/7YGd3bcO_Ys