How exactly does Cobalt Blue glass filter yellow light?
When it comes to collecting blue cobalt glassware, value certainly is in the eyes of the beholder. It is impossible to know what a particular person is going to fall in love with. Equally difficult is producing any piece of art which is able to be attractive to every person. No matter how distinguished the master, there are a few persons who will not be partial to or recognize the value of his art. On the other hand, there are items which turn out to be collectible and priceless, at least to the collector, just for the reason that you enjoy possessing them looking at them.
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When you are just beginning your collection of cobalt blue glass, or including pieces of a distinct period or artist, make sure and browse the internet. It is a terrific place to deepen your education. You can furthermore come across some remarkable bargains. But browse prudently and enjoy your interest of collecting period glassware. Bear in mind, it is not what somebody else thinks an item is worth, it is the enjoyment it brings to the person personally which makes cobalt blue glass worth collecting.
When something absorbs a specific wavelength or color in the spectrum, what you see is the opposite, or complementary color as long as that color isn’t also absorbed. Blue and yellow are complementary colors, so when it filters out the yellow, you are left with the blue light. This is why sunglasses with a yellow/orange colored polarized lens give everything a bluish tint while glasses with a blue lens give everything a yellowish tint.
Thus, Cobalt blue glassware appears blue because it is absorbing/filtering yellow light.