Take a scrap piece of fondant and experiment with the gel color alone versus fondant. The gel color will shine but I don't know about mixing it.
If you rub it with crisco it will shine but not like glass more like leather. Spray it with Pam it'll shine but be a bit oily to the touch. You can paint it with water and it will shine and be dry to the touch. See example on the black on my Bratz cake. I painted it with water and it dried to the shine you will see.
Here's the link: http://www.cakecentral.com/cake-photo_1516967.html)
A definite shine is to paint it with confectioners glaze.
There's some options for ya'! Hope it helps!
You can also use black fondant and then paint it with a mixture of half vodka half white corn syrup.
there's also an edible varnish recipe here.
http://cakecentral.com/recipes/7292/edible-varnish
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