I've tried them all, but I can't find a cookie icing that stays shiny after the cookies dry. The cookies are glossy and shiny at first, then they dry dull. I've tried using glycerine/no glycerine; water/milk; warm ingredients/cold ingredients; and just about every other variation. I've read the other forums on the subject, and I still can't figure out how to keep the icing shiny. Has anyone solved this problem yet?
I think it depends on the kind of icing you are using. Royal icing dries more matte, but the glace icings dry more glossy.
hope that helps!
I always add corn syrup to my icing and it usually has a slight shine when it dries.
I use Toba's glace and it comes out shiny... But you can't do as much details like RI does.