This article is from the Tattoo FAQ, by Stan Schwarz with numerous contributions by others.
While there are some metallic inks available, these are very rare and a
general answer to this question is a simple "no." If you have a design
that needs to look metallic, a good artist can use other colors to make
it look metallic without actually using gold or silver ink.
My understanding is that artists shy away from metallic colors because
of their toxic properties under the skin.
 
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