Cobalt Blue has been used for centuries in porcelain and paint as well as in glass. Our Cobalt Blues mix has the classic, dark Cobalt Blue as it's central theme, with a number of other shades of Blue, in both transparent and opaque versions.
Since each Float is absolutely unique, there will be some variation in appearance. Below are some photos of Floats of various styles over time with these colors, to illustrate what kind of range there might be: