The Color Of Evolution

So, many months ago I had more time to spend in late-night discussion groups...OK, it's not the time at night now, it's that I have had to get up early in the morning that's curtailed that.  The thing is, in one group somebody mentioned the emergence of the words for the color blue.  Humans didn't always distinguish this color from others.  Some languages still don't quite distinguish blue from green in all cases (when comparing with an English speaker's perception, of course).  My problem is that this person said that humans "evolved" to see blue.

"Evolved"?  So the sky was literally a different color before that?  Bluebirds were, what - greenbirds?  Or were they yellow?  I think what this person meant to say was that our perception was refined, rather than that we evolved.  We began to make distinctions between different parts of the color spectrum that we didn't before.  It may be that pigments and dyes were more available to reproduce these particular colors than before.  Blues are not especially common in cave paintings, for example.

We still create terms for different shades of color, especially when some means of reproducing that shade becomes available.  Paint or crayon colors are examples of this.  The fact that cerulean blue was not a term before the 19th century does not mean that nobody perceived that shade of color before, it only means that it was worthwhile to name at that time and not before.

If we consider multiple names for color to indicate advancement in evolution, should we consider Russian speakers to be the most evolved humans, since they have separate colors for light and dark blue?  Are we saying that most human beings are actually incapable of seeing the difference in those hues?

We did NOT evolve to see blue in the last thousand years.  We only developed the technologies to reproduce it.  Let's use language precisely.  For fuck's sake.