Color by itself doesn’t tell you much. With reds, it has to do with how much of the anthocyanins and other pigments are available and extracted. Depending on pH, it can be tend more to the blue or red spectrum, so to some degree can relate to acidity, but that’s not all there is to it.
The pigment availability has a lot to do with it - some grapes just have more than others. And, just like anything else, availability doesn’t mean it shows up in the wine because sometimes, depending on the grape, it’s just not as easy to extract. One of the reasons they add Viognier to Syrah in France is to stabilize and intensify the color.
Something like Barbera can be both dark and have lots of acidity, whereas something like Zin may have less color and less acidity. And of course, it depends on where it’s grown and how it’s vinified.
Although on its own the color of a wine doesn’t tell you much, if you have a deep, dark, thick Nebbiolo, that tells you something, and if you have a light, transparent Petite Sirah, that tells you something.
And bricking rims may indicate that the wine is older than a wine with bright purple rims.
But I’ve been way off when trying to guess a wine’s age, sometimes by decades.
So unless you know a wine/grape/region/producer, most of the time it’s pointless information to talk about the color of a red. A deeply colored wine can be anything.
With whites, it’s a little different and in some cases, easier since if you have a brown wine, and it’s young, it’s a good bet it’s oxidized.
Many grapes can produce wine with green tinges. When they are more to the gold/amber range, you might guess there’s some oak. It’s not always obvious though - Manzanilla can be pretty light.