The Blues
Blues are one of the most often seen colors in Carnival Glass and there are many varieties. Because there are so many, collectors have made distinctions between them. Here are a few of the best known. Remember, to properly see the base glass color, you should view it through a part of the piece that has little or no iridescence as the iridescence can make a difference in the perceived color.

The Millersburg Blues article

The blue in this Hearts and Flowers bowl with pie crust edge shows Northwood at it best. With red and blue iridescence flashed with gold highlights, this color is called electric blue. This Peacocks stippled plate is of medium blue with pastel iridescence. Unlike many colors in the blue range, it has yet to receive its own name. Ice blue is a very pale color and has pastel iridescence. This is Northwood's Daisy and Drape vase.
These two Florentine candlesticks provide an excellent comparison of the colors known as celeste and sapphire blue. This is a Northwood Drapery rosebowl in the color called Renninger. It's very difficult to tell the difference between this and sapphire, especially in a photo. While similar to sapphire, the base glass color is more of a smokey or muted blue.
Note: These photos were optimized to be viewed correctly on my monitor.
They may differ significantly on yours.
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