We live in an age where there are so many pigments available.
If I were to say "blue", there is a vast array of hues...almost mind boggling.

AZ Sun Flare, pastel, 16x20
It has an interesting history, as well.
In the past, when paints were made from organic and mineral pigments, it was very precious , as Ultramarine Blue was sourced from ground lapis lazuli, the mineral. It is why it was reserved for important figures in religious paintings...such as the blue for Mary's clothing.
It was back in the 19th century that the French government came up with prize money for a synthetic substitute. Hence French ultramarine blue, which we use today.
Today we have shades that range from the palest ice blue, to the deepest shades of indigo blue-black...with shifts towards green blues, and blue violets .
Artists have a whole rainbow of just blues at their disposal! There is Delft blue, Cobalt , Manganese, Prussian, Ultramarine, Cerulean, Pthalocyanine, and so many more. Each has its own qualities, and working characteristics. Many pigments have safer, non toxic substitutes, as well.
And once we consider the design industry, the blue hues seem almost endless.
It can evoke feelings...as we think of " being blue", when troubled, or depressed.
A prime example are Picasso's blue period paintings.
Blue can often evoke feelings of calm and serenity .

Monsoon Pool, 30x24
It can also help make something pop, as the distant gold trees do, surrounded by blue hues.
It can help give the illusion of distance.

"Cliff Rose Sundown"
It is used in the background to push the hills back. Note how there is a more intense shade in the foreground to render the shadows.
True blue is a pure color , as far as temperature. What I mean by that is when it shifts towards green , or violet, is that it starts to go warmer. Blue green is going towards green ( towards yellow) , and blue violet starts to move towards reds, on the color wheel.

Think of Prussian blue, which is a deep teal, or ultramarine, which has a slight violet shift.

"Canyon Dew Shine", 12x24
In this pastel, I have used blue violets, and turquoise shades. I like the play of one against the other.
In the painting examples, blue is the dominant hue.
I can't say it is a favorite color, as I love so many of them!
However, using blue well can evoke depth and feeling to the viewer.







