What does a Blue Cobalt Glass do? ?
When it comes to purchasing blue cobalt glass, value really is in the eyes of the beholder. It is not possible to tell what a particular individual is going to fall in love with. Just as challenging is creating any piece of art which is able to appeal to everybody. No matter how distinguished the master, there are particular individuals that will not be partial to or recognize the value of his talent. On the other hand, there are items which turn out to be collectible as well as priceless, at least to you, purely because you take pleasure in proudly owning them viewing them.
I have hard a bunch of sites just quoting wikipedia and don't understand what it means.
"It is appreciated for its attractive color and is also used as an optical filter in flame tests to filter out the yellow flame caused by the contamination of sodium, and expand the ability to see violet and blue hues, under fluorescent light, the cobalt glass has twice the effect."
What does "contamination of sodium" mean? Where does the sodium come in if I am burning like KCl? Isn't contamination mean being impure by sodium being present or am I using it wrong?
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You are correct about contamination; however, the best use for cobalt
blue glass is to filter out the yellow light of the sodium flame.
As you may have seen in flame tests in chemistry labs, the sodium
flame is the most intense of all, and even a little sodium impurity in a
sample being analyzed can give a strong enough yellow color to mask
the colors of any other elements present. But if you look at the flame
through a cobalt blue glass, it filters out nearly all the sodium light
while passing through light of other colors like the violet of potassium.
This effect enables you to see the flames of other elements even if
a little sodium is present which would mask the color if you didn’t
use the cobalt blue glass.