Speaking to the accuracy alone, I tested it here – yeah, it’s accurate to the hexes in the Wikipedia article. My intent was to have a traditional MacBeth Chart material that didn’t rely on an image texture (adds bulk when packed, easy to lose when not). I’m not gonna address the utility of a 1974 chart (with colors chosen for the long-term physical stability of the inks used) in digital rendering fifty years later.
2 Likes