Nice chart...also like your different color figs. Reminds me of when I used to work as a QC chemist for a dental materials company, and we tested the colors of all our products. Hope you keep your chart away from sunlight! :)
Bley on Bricklink, is that Light Bluish Grey, or Dark Bluish Grey?
[Edit] Looking closer, there is no Light Bluish Grey, just regular and dark. I'm going to assume regular Bluish Grey is Bley.