Pink Lace, Peach, Cyan, Mahogany, Apple Green, Goldenrod, Bronze, Rain Forest, Viridian
For Pink Lace, it was once purchasable but quickly removed as it's too close to neutral. Meaning that it's the rarest color on WZ.
Similarly, most if not all the colors you mentioned are deemed too similar to other colors. That being said, there is a uservocie to make WZ a 50 player game (which does mean making those colors available probably)