The color of the 2x4 plate and 1x2 jumpers in the photo appears to be regular Dark Blue:
The greenish tint you mention is likely discoloration. Here is an example of a discolored regular blue piece (right) next to a fairly new regular blue piece (left) for comparison:
How uniform or consistent the discoloraton is depends on the cause and/or ...
There has been a slight change to the Pearl Gold/Warm Gold color recently that might explain the difference in color between those pieces. See this article on Reddit. Perhaps the right two “Flat Dark Gold” pieces are the newer recolor of Pearl Gold? I recall Jang from JangBricks talking about this as well in his videos.
Here is the picture from the Reddit ...
Version (Program): 4.3.11.
Version (Brick): 2670.
We're using Extended Mode (Black Backsplash) of LDD, so we can have full access to all colors. I have not tested the other two modes, Default (Blue Backsplash) or Mindstorms (White Backsplash).
If the model is in Default Mode. No problem.
Copy the build to ...
This is an excellent question. Here's my best guess as to why this is.
As you've pointed out, LEGO System Minifigures were made with yellow heads from the start for a specific reason. On Lego.com it states:
We chose yellow to avoid assigning a specific ethnicity in sets that don't include any specific characters. With this neutral color, fans can assign ...
The fact that so many sellers have it and named the color consistently pretty much rules out discoloration.
As to why the item isn't on BrickLink (or Brickset), I can only see the following explanation:
it's in a set which hasn't been inventoried yet (but your seller would probably have known which one)
it's been produced for something else which hasn't ...
You can look for missing data in currently available lists:
Old school Peeron (no longer updated)
Bricklink list most of the brick colors available for sale.
Rebrickable has attempted to bring all colors in one place.
Brickset has also some details.
Mecabricks has one also (as PDF).
LDraw project has such list.
It would also be good to define term "...
This color chart is from LEGO's Digital Draw program.
After doing a quick skim of it, I know you're missing the "Legacy" colors. Whatever "Legacy" means here, I don't know.
Colors read from Left to Right:
316 - Titanium Metallic
315 - Silver Metallic
309 - Metalized Silver
297 - Warm Gold
310 - Metalized Gold
298 - Cool Silver, ...
This article potentially provides some insight to the type of research that product developers, such as Lego, might use to "better" their products. It's title is obviously meant to be humorous.
If research suggests that babies/children react to things like skin tone, it ...