A tutu overlay is a piece of embelished fabric that is tacked to
the tulle of a tutu. Without an overlay, the tutu is usually a
plain, solid color and is quite boring. The overlay adds
decoration.
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A gold overlay is a layer of metal that covers another base
metal. Gold overlay can be found on anything from picture frames to
mirrors.
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Jewelry with a gold overlay can possibly turn your skin green.
This is determined by if you have a skin allergy to the metal under
the overlay.
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An overlay is part of program which has the same load origin as
some other parts of the program.