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"Coloring
pencils
(i.e., those with a colored lead) are generally the same color as
the lead.
Unlike wax-based
colored pencils,
these can be easily erased. Their main use is in sketching, where
the objective is to create an outline using the same color that
other media (such as wax pencils, or
watercolor paints)
would fill or when the objective is to scan the color sketch. Some
animators prefer col-erase to graphite
pencils
because they don't smudge as easily, and the
different
colors
allow for better separation of objects in the
sketch. Copy-editors find them useful too, as their markings stand
out more than graphite but can be erased."
Source:
Fine Art Cafe
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