Some colors of carnival glass can be very specific and others possess so
many different shades it can get very confusing and sometimes ends up is
disagreements among collectors.  This is because different shades of a
particular color can mean big differences in desirability and value!  One
of the more identifiable colors that falls into this category is blue. 
Some of the different shades of blues are Cobalt, Ice Blue, Sapphire,
Celeste, Teal, and Renninger Blue.  Each one is a different shade and
interesting.  Some colors like Celeste blue is a bit darker than Ice Blue
and will usually will have a stretchy look to its iridescence and is part
of its identification.  Renninger Blue was originally discovered in an
antique mall in Adamstown, Pa called Renningers Antique Mall, hence the
name.  Renninger Blue usually has a stippled surface which in a rough
surface within the majority of the pattern.  This may have been added as
moulds used in the production began to wear out and it revive d the mould
giving the finished product a new look holding the iridescent spray very
well.

There are a few shades of Green too. A standard green, a darker forest
green, and Ice Green.  The term Emerald green is a color that refers to the
iridescence rather than the base glass color.  Emerald Green will be very
vibrant and will also possess a blue iridescence. Well any, these are just
a couple of examples of color variation.

For the most part, carnival glass color is determined by the color of the
base glass.  Some of the more general colors that carnival glass was
produced in are:
Blue
Amethyst
Black Amethyst
Green
Ice Blue
Ice green
White (on clear glass)
Marigold (on clear glass)
Aqua
Red (often with slight amber edging)

Colors produced were more common with some makers than others. For example,
Millersburg made much smaller amounts of blue carnival glass than others
and is rare and usually rather expensive.  Red was primarily produced by
Fenton (Imperial made very limited production) and is somewhat rare and
usually commands higher prices.  Aqua Opalescent was made primarily by
Northwood and is rare when produced by Fenton.  Usually when the color is
produced with an opalescent edge that commands higher pricing.  Some pastel
colors may have a "Stretchy" look to it and that will command
higher prices.

Some much rarer colors that were produced would be iridized custard with a
marigold overlay.  Persian Blue which is a semi-opaque milky blue that is
iridized.  That color was primarily produced by Fenton as well as
Moonstone.

There is much more to the subject of colors and certainly a much wider
spectrum of colors but we will leave it here for the purpose of
illustration for the article.
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