Hi, the sky is so pretty and blue today. Blue is my favorite color. What's yours.
I really like blue as well. Especially blues that have an ultramarine shade, with lovely violet in it. 
There really are a lot of different shades of blue, that's for sure.
Very true. It's kind of cool that there is something called the Rayleigh scattering that causes the sky to be blue and the dark color of the sea. It's an optical effect of sorts.
I think it was first produced by the Egyptians who figured out how to create a pigment for their decorative arts.
I didn't know that, interesting. Another little fact, as my children have blue eyes, it's caused by from Tyndall scattering, which is light in the stroma of the iris.
Cool. The Egyptians held it high regard and even used it to decorate tombs of the pharoahs.
I knew blue is one of three primary colors in color theory and painting used, but didn't know that about the Egyptians use. Learn something new every day!
It's a very calming peaceful color too, not sure why it is also associated with depression and feelin "blue".
it in the windows of cathedrals. Europeans wore clothing coloured with the vegetable dye woad until it was replaced by the finer indigo from America. In the 19th century, synthetic blue dyes and pigments gradually replaced mineral pigments and synthetic dyes. Dark blue became a common colour for military uniforms and later, in the late 20th century, for business suits. Because blue has commonly been associated with harmony, it was chosen as the colour of the flags of the United Nations and the European Union.
Surveys in the US and
Theo, "'Cobalt [blue] is a divine colour and there is nothing so beautiful for putting atmosphere around things ..."
Van Gogh described to his brother Theo how he composed a sky: "The dark blue sky is spotted with clouds of an even darker blue than the fundamental blue of intense cobalt, and others of a lighter blue, like the bluish white of the Milky Way ... the sea was very dark ultramarine, the shore a sort of violet and of light red as I see it